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VCS-253 - Administration of Veritas Cluster Server 6.0 for UNIX - Dump Information

Vendor : Veritas
Exam Code : VCS-253
Exam Name : Administration of Veritas Cluster Server 6.0 for UNIX
Questions and Answers : 235 Q & A
Updated On : December 10, 2018
PDF Download Mirror : VCS-253 Brain Dump
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VCS-253 Administration of Veritas Cluster Server 6.0 for UNIX

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VCS-253 exam Dumps Source : Administration of Veritas Cluster Server 6.0 for UNIX

Test Code : VCS-253
Test Name : Administration of Veritas Cluster Server 6.0 for UNIX
Vendor Name : Veritas
Q&A : 235 Real Questions

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Veritas Administration of Veritas Cluster

Astronomers discover once-in-a-lifetime gamma rays | killexams.com Real Questions and Pass4sure dumps

UD Professor Jamie Holder (left) and doctoral scholar Tyler Williamson have been gaining knowledge of gamma rays with the assist of the VERITAS telescopes located on the Fred Lawrence Whipple Observatory in Amado, Arizona. credit score: college of Delaware

Scientists have discovered something magnificent.

In a cluster of one of the most massive and luminous stars in our galaxy, about 5,000 gentle years from Earth, astronomers detected particles being accelerated by means of a all of a sudden rotating neutron famous person because it passed with the aid of the large big name it orbits best as soon as every 50 years.

the invention is extremely infrequent, in response to institution of Delaware astrophysicist Jamie Holder and doctoral student Tyler Williamson, who were part of the overseas team that documented the occurrence.

Holder known as this eccentric pair of gravitationally linked stars a "gamma-ray binary system" and likened the once-in-a-lifetime event to the advent of Halley's comet or final 12 months's U.S. photo voltaic eclipse.

huge stars are among the many brightest stars in our galaxy. Neutron stars are extraordinarily dense and lively stars that result when a enormous big name explodes.

This binary device is a enormous celebrity with a neutron celebrity orbiting around it. Of the 100 billion stars in our galaxy, below 10 are normal to be this type of equipment.

Even fewer—handiest two programs, together with this one—are widely used to have an identified neutron superstar, or pulsar, that emits pulses of radio waves that scientists can measure. here's critical since it tells astronomers very precisely how much energy is obtainable to speed up particles, anything scientists understand little about.

"You could not ask for a higher herbal laboratory to examine particle acceleration in a always changing atmosphere - at energies some distance beyond anything else we are able to produce on earth," pointed out Holder, a professor in UD's department of Physics and Astronomy.

The assignment was led by means of a crew of scientists, together with Holder and Williamson, the usage of the VERITAS telescope array on the Fred Lawrence Whipple Observatory in Arizona, in collaboration with scientists using the MAGIC telescopes at the Roque de los Muchachos Observatory determined in La Palma, an island of the Canary Islands, Spain. (VERITAS stands for terribly full of life Radiation Imaging Telescope Array device and MAGIC stands for most important Atmospheric Gamma Imaging Cherenkov telescopes.)

probably the most VERITAS telescopes at sunset. credit score: institution of Delaware

The researchers lately reported their findings within the Astrophysical Journal Letters.

Hoping for fireworks

The natural query, to many minds, is why do scientists care about accelerated particles?

"as a result of our galaxy is filled with them. We call them cosmic rays and that they elevate as a lot energy because the light from all of the stars," spoke of Holder.

Astronomers found out more than a hundred years in the past that accelerated particles exist, yet how or the place these particles speed up is still a mystery. Pulsars are among the most severe objects in the universe and that they have magnetic fields around them which are thousands and thousands of times more suitable than the rest scientists could hope to build on the earth. When a pulsar encounters dirt or gasoline close to a massive superstar, the particles nearby speed up—to close velocity of light velocities—and collide with what's round them. The outcomes is a beam of high-power light referred to as gamma-radiation or gamma rays.

sophisticated telescopes, like those operated by way of VERITAS and MAGIC, can observe these gamma rays as a result of they emit a blue flash of mild when they attain the Earth's ambiance. whereas our eyes cannot see these flashes of light because they're too quick, best nanoseconds lengthy, these telescopes can.

once-in-a-lifetime doctoral experience

Astronomers first discovered gamma rays coming from the pulsar during this strange pair of stars in 2008. concerning the size of Newark, Delaware, the pulsar is spinning just like the attachment on a kitchen blender, emitting little pulses of gamma rays and radio waves with every rotation.

by way of measuring these radio pulse frequencies, astronomers were able to tell how fast the pulsar become relocating and calculate exactly when it could be closest to the big star that it was orbiting—Nov. 13, 2017. it's a trip that took 50 years.

UD Professor Jamie Holder is dwarfed by using one of the most VERITAS cameras. credit: tuition of Delaware

The VERITAS and MAGIC teams begun monitoring the evening sky and monitoring the pulsar's orbit in September 2016. at the start, they weren't even sure in the event that they would see anything else. but in September 2017 the astronomers started to observe a fast boost within the variety of gamma rays hitting the top of the earth's atmosphere.

As they monitored the statistics coming from the VERITAS telescopes, Holder and Williamson realized that the pulsar changed into doing some thing distinct daily.

"i might wake up every morning and examine and spot if we had new statistics, then analyze it as speedy as I could, as a result of there were times where the variety of gamma rays we had been seeing became changing impulsively over a day or two," referred to Williamson, a fourth-year doctoral pupil.

during the closest method between the superstar and the pulsar in November 2017, Williamson noticed that the VERITAS telescopes had—overnight—recorded ten times the number of gamma rays detected best just a few days before.

"I double checked every little thing before sending the facts to our collaborators," Williamson stated. "Then one in all our companions, Ralph hen at UCLA, established he'd gotten the same results; that become wonderful."

much more pleasing—this observational statistics didn't healthy what predictive models had expected.

frequently speaking, Holder observed, latest fashions anticipated that because the pulsar approached the massive famous person it became orbiting, the variety of gamma rays produced would slowly speed up, experience some volatility and then slowly decay over time.

"however our recorded records showed a big spike within the variety of gamma rays as a substitute," Holder stated. "This tells us that we need to revise the models of how this particle acceleration is going on."

What's greater, in line with Holder, while astrophysicists anticipated the national Aeronautics and house Administration's (NASA) Fermi gamma-ray area telescope to record these gamma rays, it didn't. Holder pointed out the reason for here is unclear, but that is a part of what makes the VERITAS results so enjoyable.

UD doctoral student Tyler Williamson standing on one of the most VERITAS telescope entry systems. credit: university of Delaware

Astrophysicists want to be trained just which particles are being accelerated, and what procedures are pushing them up to these extreme speeds, to be able to understand more concerning the Universe. Holder pointed out that youngsters gamma-ray binary programs likely do not speed up a big component of the particles in our galaxy, they allow scientists to look at the category of acceleration mechanisms which may produce them.

Charting a promising future

Astronomers might not be capable of see this binary gadget at work once more unless 2067 when both stars are as soon as once more shut together. by using then, Williamson joked that he simply could be an emeritus professor with time on his fingers.

at the moment, Williamson isn't involved about operating out of things to do. He spent three months on the Arizona-based observatory earlier this 12 months, taking measurements, performing hardware renovation and devising a faraway control to enable the researchers to turn on the telescope's cameras from a pc inner a control room.

"It changed into an outstanding chance to spend palms-on time with the telescopes and get to know the instrument," said Williamson.

Going ahead, he'll spend the remainder of his doctoral stories combing via and inspecting in improved detail the very nearly a hundred seventy five hours of statistics the VERITAS telescopes accrued in 2016 and 2017.

"Tyler is, clearly, the luckiest graduate student I've ever met because this event that occurs most effective as soon as every 50 years—one of the most enjoyable issues we've got viewed with our telescopes in a decade—passed off appropriate within the middle of his doctoral work," pointed out Holder.

explore further: Kes seventy five—Milky approach's youngest pulsar exposes secrets of celebrity's demise

greater counsel: A. U. Abeysekara et al. VERITAS Observations of the BL Lac Object TXS 0506+056, The Astrophysical Journal (2018). DOI: 10.3847/2041-8213/aad053


Cosmic fireworks | killexams.com Real Questions and Pass4sure dumps

As they monitored the data coming from the VERITAS telescopes, Holder and Williamson realized that the pulsar became doing some thing diverse day to day.

“i might wake up each morning and assess and spot if we had new records, then analyze it as quick as I could, as a result of there were times the place the number of gamma rays we were seeing become altering rapidly over a day or two,” spoke of Williamson, a fourth-year doctoral student.

throughout the closest approach between the big name and the pulsar in November 2017, Williamson observed that the VERITAS telescopes had — in a single day — recorded ten times the number of gamma rays detected only just a few days before.

“I double checked every thing before sending the facts to our collaborators,” Williamson spoke of. “Then one in all our companions, Ralph chicken at UCLA, established he’d gotten the same outcomes; that became entertaining.”

much more entertaining — this observational information did not fit what predictive fashions had estimated.

frequently speakme, Holder pointed out, present models envisioned that because the pulsar approached the big star it changed into orbiting, the variety of gamma rays produced would slowly speed up, journey some volatility and then slowly decay over time.

“however our recorded statistics showed a tremendous spike in the number of gamma rays in its place,” Holder noted. “This tells us that we should revise the models of how this particle acceleration is going on.”

What’s more, in line with Holder, while astrophysicists anticipated the country wide Aeronautics and space Administration’s (NASA) Fermi gamma-ray house telescope to list these gamma rays, it didn’t. Holder said the reason for here's doubtful, but that is a part of what makes the VERITAS outcomes so pleasing.

Astrophysicists are looking to learn just which particles are being accelerated, and what tactics are pushing them up to those extreme speeds, with the intention to be mindful extra about the Universe. Holder spoke of that despite the fact gamma-ray binary programs probably don’t speed up a huge portion of the particles in our galaxy, they enable scientists to look at the class of acceleration mechanisms which may produce them.

Charting a promising future

Astronomers won’t be able to see this binary equipment at work once more until 2067 when both stars are once once again close collectively. via then, Williamson joked that he just can be an emeritus professor with time on his palms.

in the mean time, Williamson is not worried about working out of things to do. He spent three months on the Arizona-primarily based observatory previous this yr, taking measurements, performing hardware preservation and devising a far off manage to enable the researchers to turn on the telescope’s cameras from a laptop internal a handle room.

“It turned into a fine opportunity to spend palms-on time with the telescopes and get to grasp the instrument,” noted Williamson.

Going ahead, he’ll spend the remainder of his doctoral experiences combing through and examining in more advantageous element the practically a hundred seventy five hours of statistics the VERITAS telescopes amassed in 2016 and 2017.

“Tyler is, sincerely, the luckiest graduate scholar I’ve ever met as a result of this adventure that happens simplest as soon as every 50 years — probably the most unique issues we’ve viewed with our telescopes in a decade — passed off correct within the core of his doctoral work,” spoke of Holder.

Funding for this work was provided by means of the countrywide Science groundwork and NASA.


VERITAS publicizes IT matters; Celebrates 15 Years of Innovation and Affirms vision for Utility Computing | killexams.com Real Questions and Pass4sure dumps

MOUNTAIN VIEW, Calif.--(enterprise WIRE)--Sept. 15, 2004--   A Pioneer in utility Innovation; company Highlights Key Contributions to consumer Success  

VERITAS application company (Nasdaq:VRTS) these days celebrated its 15 12 months anniversary and mirrored on its rich history of innovation by means of recognizing key innovators, their accomplishments and how they are pondering in regards to the future and enabling utility computing. Key to the enterprise's confirmed song record of innovation are its contributions to constructing the business's first mighty quantity manager and file device, offering business main lower back-up and facts coverage utility and protecting shoppers from disaster with excessive availability application. The commonplace thread woven right through the company's heritage is an uncanny ability to place the complications of valued clientele first before establishing and providing utility options to hold modern-day records centers up and running. With a attractiveness for providing resourceful software and engineering excellence VERITAS is neatly positioned to circulate valued clientele toward the subsequent paradigm in computing, utility computing.

"Computing has been through completely extraordinary exchange in the past 15 years, going from the mainframe to client/server to internet-based mostly methods and turning out to be ever greater complex at every step. IT has discovered it increasingly difficult to control this complexity and deliver value to the enterprise," spoke of Gary Bloom, chairman, president and CEO, VERITAS software. "anticipating the subsequent 15 years, VERITAS goes to continue to dispose of complexity from IT, assisting consumers turn into extra productive by riding up utilization of their hardware, and using down their labor costs."

Humble Beginnings

VERITAS utility business enterprise emerged from Tolerant application, Inc. in 1989 which emerged from Tolerant Transaction methods, Inc., a fault tolerant computing programs company first established in 1982. In 1988 pioneer and co-founder Dale Shipley fashioned a small software firm referred to as Tolerant application to pursue engineering excellence in setting up utility intended to be sure the availability of computing systems and the mission critical functions that run across them. From its modest beginnings and tiny staff of gifted engineers the business straight away developed an aptitude for being attentive to purchasers and responding with innovative application-based solutions to their problems. today, VERITAS application is a leading impartial provider of application that permits utility computing using more than 7,a hundred people and conducting company in additional than forty nations around the world.

"From the beginning in 1989 when we fashioned VERITAS software the cornerstone of our success established upon convincing and securing the guide of AT&T UNIX gadget Laboratories, Inc. to have confidence us to extract the effective code from the Tolerant systems high availability working gadget and boost and carry the trade's first potent UNIX device V transaction-primarily based quantity supervisor and file equipment thereby contributing the early success of AT&T and sun Microsystems within the promising UNIX industry," talked about Dale Shipley, VERITAS co-founder. "It became this calculated possibility that opened the door to the wide horizontal adoption of VERITAS application by the myriad of UNIX systems companies and paved the course towards the business's leadership in storage management and information insurance plan. The business's initial cost proposition nevertheless holds authentic nowadays, a corporation's most positive IT belongings don't seem to be the hardware programs, however somewhat the information that resides on and runs across them and the insurance policy and availability of that data is paramount."

quality, risk and Persistence: volume supervisor and File gadget Emerge

From the starting, the engineers had been considering imaginitive tips on how to dramatically enrich the provision of computing operating methods first via fixing essential issues after which by taking up more complicated strategies. In 1989 if an IT manager desired to makes alterations to the file system of their UNIX computing ambiance it intended bringing the device all the way down to make adjustments after which bringing it again up with the hope that the changes would not disrupt availability further. The fledging enterprise's strategy at the start centered on three key priorities: first, eliminate system downtime, 2d simplify overly complex initiatives and enhance a Graphical user Interface (GUI) to imagine storage administration and administrative tasks and third adopt a maniacal focal point toward enhancing the performance of methods. The enterprise had a steep hill to climb in convincing dozens of leading computing device companies that VERITAS may build, convey and help a far better exceptional file device than they may themselves at a reduce can charge and with more suitable efficiency capabilities. at the time shoppers have been caught with the file device that shipped with their device dealer's operating device and that meant loads of time invested in managing and administering disparate computing techniques. VERITAS took a calculated possibility that consumers would respond favorably to systems that could be managed, modified and administered devoid of disruption. The possibility paid off handsomely with the emergence of VERITAS extent manager in 1990 and VERITAS File device in 1991, two of the company's flagship items that can also be discovered on the heart of well-nigh 70 % of the area's facts facilities these days.

"one of the most issues that distinguishes VERITAS with customers is that we take a company method to innovation versus an engineering method," talked about John Colgrove, VERITAS Fellow and 15 year veteran, VERITAS. "if you listen to client's complications and what they're making an attempt to do and also you hearken to their desires you get ideas for a way you could go and create options to solve them. This continues to be our future method and we're engaged on some very entertaining things for customers so one can really bring large price once they choose our application."

statistics protection Mastered

VERITAS is the de-facto industry common for records backup and information coverage offering utility to meet the wants of the world's smallest organizations and biggest corporations. always innovating and bringing new performance to data protection, VERITAS merged with OpenVision in 1997 and delivered its first unlock of VERITAS NetBackup(TM) software to valued clientele. From the beginning the engineers have been set on offering essentially the most innovative records coverage application that delivered the optimum efficiency with the least impact to conclusion-users. NetBackup application helps each leading operating system and was the primary to market with help for Linux in 1999. these days, VERITAS NetBackup utility is the trade's No. 1 backup and recovery software and allows IT companies to in the reduction of administration and hardware expenses by means of taking knowledge of superior enterprise facets, corresponding to synthetics, disk-based protection, computerized disaster healing and laptop and desktop insurance policy.

The 2d key facts protection milestone got here in 1999 when VERITAS got Seagate application's network and Storage management group and the business's leading Microsoft home windows backup utility for small to mid-sized agencies, VERITAS Backup Exec(TM). fast, easy to manipulate and simple to install in 10 minutes or less, Backup Exec software ensures the insurance policy of statistics throughout windows environments. today, Backup Exec application serves the information insurance plan needs of greater than a million customers all over the world.

A Pioneer in disaster recovery

VERITAS has long been a pioneer in constructing and delivering inventive clustering and disaster restoration application. From the time that VERITAS obtained Tidal Wave and its first excessive availability product First Watch in 1995, a rudimentary two node single utility failover SCSI-based mostly answer, its lead engineers have been already brooding about developing advanced clustering options that might scale to eight, sixteen or 32 nodes and ensure the availability of dissimilar purposes running across Storage area Networks (SANs) with large area network failover and disaster healing. In 1998 VERITAS delivered its first unlock of VERITAS Cluster Server bringing superior clustering capabilities to each most important working system from solar Solaris to Microsoft windows to pink Hat Linux together with integration with VERITAS Cluster File system and VERITAS Cluster extent manager to ensure the provision and manageability of dozens of applications running throughout increasingly refined and scaleable IT environments.

"When it comes to your catastrophe healing plan, you only get one chance to get it correct since you cannot ask a hurricane or an earthquake or an influence outage to return lower back day after today," mentioned Jason Bloomstein, personnel utility engineer and 7 year veteran, VERITAS. "in case your plan does not work, all of the IT infrastructure that you've invested in and deployed goes to waste, but if you've got the ability to look at various disaster restoration eventualities on a every day foundation with out bringing your production environment down then abruptly which you can maximize these IT investments and get a fine return on those investments on your company."

The journey to Utility Computing Commences

As customers make the trek towards utility computing VERITAS is innovating continually to bring increasingly subtle application to market. The latest choices permit IT managers to shift from reactive issue resolution to proactive availability and failover checking out to address issues with storage, servers and purposes before they impact the enterprise. by means of combining VERITAS Cluster Server with VERITAS i3(TM), VERITAS OpForce(TM) and VERITAS UpScale(TM) software (scheduled for unencumber in 2005), IT managers will promptly recognise the enormous can charge savings and return on funding of automating their IT infrastructure. In an automated ambiance, if an application's performance deteriorates to an unacceptable degree VERITAS i3 application is designed to alert IT managers before the problem influences end-clients and supply insight into a way to foremost clear up the difficulty. If the difficulty stems from inadequate processing vigour, VERITAS OpForce utility can instantly provision additional servers and in 2005 VERITAS UpScale application, an acquired Ejasent technology, can migrate the purposes alongside to the brand new cluster of their present state making certain that conclusion-clients stay highly productive. Add to that the VERITAS Cluster File gadget and VERITAS Cluster volume supervisor along with the bullet-proof reliability of VERITAS NetBackup application and IT managers are well on their way towards aligning IT tightly with the changing needs of the enterprise and realizing the promise of utility computing.

"Utility computing is a lot just like the container full of wood building blocks at your child's school; at some point the little ones share the blocks to construct a fortress and an area station and tomorrow they use the identical blocks to construct some thing their imaginations come up with," stated Oleg Kiselev, technical director and 14 yr veteran, VERITAS. "Now apply that analogy to a field full of IT building blocks-- storage, servers, switches and application. With VERITAS application it can provision these supplies when they're needed, the place they are needed, as they may be necessary and after they aren't any longer needed they can region them again in a useful resource pool or put them lower back within the field. Add to this the potential to automatically specify and keep agreed upon application provider and availability degrees and provide excellent-grain utilization accounting and you have got a magnificent set of building blocks. In a nutshell our method is to convey the application constructing blocks that enable utility computing."

About VERITAS software

VERITAS application, some of the 10 greatest utility agencies on this planet, is a leading provider of software to permit utility computing. In a utility computing model, IT substances are aligned with company needs, and company purposes are delivered with most beneficial efficiency and availability on top of shared computing infrastructure, minimizing hardware and labor fees. With 2003 revenues of $1.75 billion, VERITAS gives you items for facts coverage, storage & server management, high availability and utility efficiency administration which are used via ninety nine percent of the Fortune 500. more guidance about VERITAS software may also be found at www.veritas.com.

Copyright (C) 2004 VERITAS utility supplier. All rights reserved. VERITAS, the VERITAS emblem, Backup Exec, i3, NetBackup, OpForce, and UpScale are trademarks or registered trademarks of VERITAS software enterprise or its associates in the U.S. and different international locations. different names may well be trademarks of their respective corporations.


VCS-253 Administration of Veritas Cluster Server 6.0 for UNIX

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VCS-253 exam Dumps Source : Administration of Veritas Cluster Server 6.0 for UNIX

Test Code : VCS-253
Test Name : Administration of Veritas Cluster Server 6.0 for UNIX
Vendor Name : Veritas
Q&A : 235 Real Questions

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Administration of Veritas Cluster Server 6.0 for UNIX

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Veritas Cluster Server for UNIX | killexams.com real questions and Pass4sure dumps

No result found, try new keyword!For individuals who have the knowledge and skills necessary to plan, install, implement, and maintain Veritas Cluster Server 5.0 on a UNIX platform. You must pass the Administration of High Availabili...

Symantec launches high availability software for virtual, physical servers | killexams.com real questions and Pass4sure dumps

Symantec Corp. today launched version 6.0 of its high availability software and storage management applications, including new Virtual Business Services (VBS) for recovery of applications across multiple business units, operating systems and storage platforms.

Symantec also added built-in data deduplication and compression at the file-system level, as well as the ability to shrink or expand thin provisioned storage from Veritas Storage Foundation and Veritas Cluster File System.

VBS is the centerpiece of the HA applications for disaster recovery. VBS is designed to give administrators and business groups a coordinated method for automated high availability and recovery of multiple, interdependent applications, plus all the supporting physical and virtual technologies.

VBS is integrated in Veritas Operations Manager (VOM), Veritas Cluster Server (VCS), Symantec ApplicationHA and Veritas Storage Foundation HA for Windows.

 “We want to give visibility and the ability to automatically recovery entire business servers,” said Dan Lamorena, director of product marketing for Symantec’s storage and availability management group. “In this launch, we expanded a lot of capabilities. There is a lot of automation and scheduling and the ability to see across business units and see the interdependencies from the applications to the spindle.”

As an example, an application that goes down could require coordinated efforts of the Web service, application and database groups to restore. Through a centralized view from Veritas Operations Manager, VBS allows those groups to automatically and simultaneously bring the application back into service.

David Chapa, senior analyst for Enterprise Strategy Group, said VBS requires a great deal of coordination between applications and servers throughout an organization. The coordination is handled through Symantec’s VOM, the central management console for all of the storage management and HA products.

“You have to make sure all the connective tissues are reattached when an application goes down,” said Chapa. “Everything rolls into VOM. VBS is the construct that touches all these products. They are simplifying management for availability of applications by focusing on the business problem. Those interdependent servers collectively define a business service.”

VBS is backward compatible with Veritas Cluster Server 5.1 and all versions of ApplicationHA.

What else is new in HA

The company claimed Veritas Storage Foundation HA for Windows can now fail over business-critical Windows applications in one minute. It also has automated application recovery for Hyper-V machines across wide area distances and clusters.

The company also said Veritas VirtualStore now clones virtual machines with FileSnap and deduplication, and offers file-level replication of VMWare’s Virtual Machine Disk Format (VMDK) files across sites and clustered iSCSI support for scalable performance for block storage over IP.

Veritas Replicator now has volume and file-based replication across multi-vendor storage. Previously, the product only handled volume-based replication. Symantec ApplicationHA now supports Linux and Unix as well as VMware vSphere 5.0.

Storage Foundation adds primary dedupe, compression

Symantec added post-process deduplication and compression to Storage Foundation and Veritas Cluster File System. The data reduction takes place at the file level in virtual and physical environments. Chapa said a pre-set window is used in which a pointer is set on original data and then all redundant data is targeted thereafter.

“They are targeting virtual machine storage with this because there is a vast amount of redundancies in VMs,” Chapa said. “This is where they are seeing the most traction with this.”

Plus, VOM now can provide management visibility for network attached storage (NAS) environments. Previously, the product focused only on storage area networks (SANs).

Storage Foundation and VCS  can also now provide predictive visibility into storage reclamation for thin provisioning, so administrators can shrink or expand thinly provisioned storage.


King of the network operating systems | killexams.com real questions and Pass4sure dumps

COMPUTINGFrom...Network World Fusion networking

January 24, 2000Web posted at: 12:11 p.m. EST (1711 GMT)

by John Bass and James Robinson, Network World Test Alliance

(IDG) -- It all boils down to what you're looking for in a network operating system (NOS).

Do you want it lean and flexible so you can install it any way you please? Perhaps administration bells and management whistles are what you need so you can deploy several hundred servers. Or maybe you want an operating system that's robust enough so that you sleep like a baby at night?

The good news is that there is a NOS waiting just for you. After the rash of recent software revisions, we took an in-depth look at four of the major NOSes on the market: Microsoft's Windows 2000 Advanced Server, Novell's NetWare 5.1, Red Hat Software's Linux 6.1 and The Santa Cruz Operation's (SCO) UnixWare 7.1.1. Sun declined our invitation to submit Solaris because the company says it's working on a new version.

Microsoft's Windows 2000 edges out NetWare for the Network World Blue Ribbon Award. Windows 2000 tops the field with its management interface, server monitoring tools, storage management facilities and security measures.

However, if it's performance you're after, no product came close to Novell's NetWare 5.1's numbers in our exhaustive file service and network benchmarks. With its lightning-fast engine and Novell's directory-based administration, NetWare offers a great base for an enterprise network.

We found the latest release of Red Hat's commercial Linux bundle led the list for flexibility because its modular design lets you pare down the operating system to suit the task at hand. Additionally, you can create scripts out of multiple Linux commands to automate tasks across a distributed environment.

While SCO's UnixWare seemed to lag behind the pack in terms of file service performance and NOS-based administration features, its scalability features make it a strong candidate for running enterprise applications.

The numbers are in

Regardless of the job you saddle your server with, it has to perform well at reading and writing files and sending them across the network. We designed two benchmark suites to measure each NOS in these two categories. To reflect the real world, our benchmark tests consider a wide range of server conditions.

NetWare was the hands-down leader in our performance benchmarking, taking first place in two-thirds of the file tests and earning top billing in the network tests.

Red Hat Linux followed NetWare in file performance overall and even outpaced the leader in file tests where the read/write loads were small. However, Linux did not perform well handling large loads - those tests in which there were more than 100 users. Under heavier user loads, Linux had a tendency to stop servicing file requests for a short period and then start up again.

Windows 2000 demonstrated poor write performance across all our file tests. In fact, we found that its write performance was about 10% of its read performance. After consulting with both Microsoft and Client/Server Solutions, the author of the Benchmark Factory testing tool we used, we determined that the poor write performance could be due to two factors. One, which we were unable to verify, might be a possible performance problem with the SCSI driver for the hardware we used.

More significant, though, was an issue with our test software. Benchmark Factory sends a write-through flag in each of its write requests that is supposed to cause the server to update cache, if appropriate, and then force a write to disk. When the write to disk occurs, the write call is released and the next request can be sent.

At first glance, it appeared as if Windows 2000 was the only operating system to honor this write-through flag because its write performance was so poor. Therefore, we ran a second round of write tests with the flag turned off.

With the flag turned off, NetWare's write performance increased by 30%. This test proved that Novell does indeed honor the write-through flag and will write to disk for each write request when that flag is set. But when the write-through flag is disabled, NetWare writes to disk in a more efficient manner by batching together contiguous blocks of data on the cache and writing all those blocks to disk at once.

Likewise, Red Hat Linux's performance increased by 10% to 15% when the write-through flag was turned off. When we examined the Samba file system code, we found that it too honors the write-through flag. The Samba code then finds an optimum time during the read/write sequence to write to disk.

This second round of file testing proves that Windows 2000 is dependent on its file system cache to optimize write performance. The results of the testing with the write-through flag off were much higher - as much as 20 times faster. However, Windows 2000 still fell behind both NetWare and RedHat Linux in the file write tests when the write-through flag was off.

SCO honors the write-through flag by default, since its journaling file system is constructed to maximize data integrity by writing to disk for all write requests. The results in the write tests with the write-through flag on were very similar to the test results with the write-through flag turned off.

For the network benchmark, we developed two tests. Our long TCP transaction test measured the bandwidth each server can sustain, while our short TCP transaction test measured each server's ability to handle large numbers of network sessions with small file transactions.

Despite a poor showing in the file benchmark, Windows 2000 came out on top in the long TCP transaction test. Windows 2000 is the only NOS with a multithreaded IP stack, which allows it to handle network requests with multiple processors. Novell and Red Hat say they are working on integrating this capability into their products.

NetWare and Linux also registered strong long TCP test results, coming in second and third, respectively.

In the short TCP transaction test, NetWare came out the clear winner. Linux earned second place in spite of its lack of support for abortive TCP closes, a method by which an operating system can quickly tear down TCP connections. Our testing software, Ganymede Software's Chariot, uses abortive closes in its TCP tests.

Moving into management

As enterprise networks grow to require more servers and support more end users, NOS management tools become crucial elements in keeping networks under control. We looked at the management interfaces of each product and drilled down into how each handled server monitoring, client administration, file and print management, and storage management.

We found Windows 2000 and NetWare provide equally useful management interfaces.

Microsoft Management Console (MMC) is the glue that holds most of the Windows 2000 management functionality together. This configurable graphical user interface (GUI) lets you snap in Microsoft and third-party applets that customize its functionality. It's a two-paned interface, much like Windows Explorer, with a nested list on the left and selection details on the right. The console is easy to use and lets you configure many local server elements, including users, disks, and system settings such as time and date.

MMC also lets you implement management policies for groups of users and computers using Active Directory, Microsoft's new directory service. From the Active Directory management tool inside MMC, you can configure users and change policies.

The network configuration tools are found in a separate application that opens when you click on the Network Places icon on the desktop. Each network interface is listed inside this window. You can add and change protocols and configure, enable and disable interfaces from here without rebooting.

NetWare offers several interfaces for server configuration and management. These tools offer duplicate functionality, but each is useful depending from where you are trying to manage the system. The System Console offers a number of tools for server configuration. One of the most useful is NWConfig, which lets you change start-up files, install system modules and configure the storage subsystem. NWConfig is simple, intuitive and predictable.

ConsoleOne is a Java-based interface with a few graphical tools for managing and configuring NetWare. Third-party administration tools can plug into ConsoleOne and let you manage multiple services. We think ConsoleOne's interface is a bit unsophisticated, but it works well enough for those who must have a Windows- based manager.

Novell also offers a Web-accessible management application called NetWare Management Portal, which lets you manage NetWare servers remotely from a browser, and NWAdmin32, a relatively simple client-side tool for administering Novell Directory Services (NDS) from a Windows 95, 98 or NT client.

Red Hat's overall systems management interface is called LinuxConf and can run as a graphical or text-based application. The graphical interface, which resembles that of MMC, works well but has some layout issues that make it difficult to use at times. For example, when you run a setup application that takes up a lot of the screen, the system resizes the application larger than the desktop size.

Still, you can manage pretty much anything on the server from LinuxConf, and you can use it locally or remotely over the Web or via telnet. You can configure system parameters such as network addresses; file system settings and user accounts; and set up add-on services such as Samba - which is a service that lets Windows clients get to files residing on a Linux server - and FTP and Web servers. You can apply changes without rebooting the system.

Overall, Red Hat's interface is useful and the underlying tools are powerful and flexible, but LinuxConf lacks the polish of the other vendors' tools.

SCO Admin is a GUI-based front end for about 50 SCO UnixWare configuration and management tools in one window. When you click on a tool, it brings up the application to manage that item in a separate window.

Some of SCO's tools are GUI-based while others are text-based. The server required a reboot to apply many of the changes. On the plus side, you can manage multiple UnixWare servers from SCOAdmin.

SCO also offers a useful Java-based remote administration tool called WebTop that works from your browser.

An eye on the servers and clients

One important administration task is monitoring the server itself. Microsoft leads the pack in how well you can keep an eye on your server's internals.

The Windows 2000 System Monitor lets you view a real-time, running graph of system operations, such as CPU and network utilization, and memory and disk usage. We used these tools extensively to determine the effect of our benchmark tests on the operating system. Another tool called Network Monitor has a basic network packet analyzer that lets you see the types of packets coming into the server. Together, these Microsoft utilities can be used to compare performance and capacity across multiple Windows 2000 servers.

NetWare's Monitor utility displays processor utilization, memory usage and buffer utilization on a local server. If you know what to look for, it can be a powerful tool for diagnosing bottlenecks in the system. Learning the meaning of each of the monitored parameters is a bit of a challenge, though.

If you want to look at performance statistics across multiple servers, you can tap into Novell's Web Management Portal.

Red Hat offers the standard Linux command-line tools for monitoring the server, such as iostat and vmstat. It has no graphical monitoring tools.

As with any Unix operating system, you can write scripts to automate these tools across Linux servers. However, these tools are typically cryptic and require a high level of proficiency to use effectively. A suite of graphical monitoring tools would be a great addition to Red Hat's Linux distribution.

UnixWare also offers a number of monitoring tools. System Monitor is UnixWare's simple but limited GUI for monitoring processor and memory utilization. The sar and rtpm command-line tools together list real-time system utilization of buffer, CPUs and disks. Together, these tools give you a good overall idea of the load on the server.

Client administration

Along with managing the server, you must manage its users. It's no surprise that the two NOSes that ship with an integrated directory service topped the field in client administration tools.

We were able to configure user permissions via Microsoft's Active Directory and the directory administration tool in MMC. You can group users and computers into organizational units and apply policies to them.

You can manage Novell's NDS and NetWare clients with ConsoleOne, NWAdmin or NetWare Management Portal. Each can create users, manage file space, and set permissions and rights. Additionally, NetWare ships with a five-user version of Novell's ZENworks tool, which offers desktop administration services such as hardware and software inventory, software distribution and remote control services.

Red Hat Linux doesn't offer much in the way of client administration features. You must control local users through Unix permission configuration mechanisms.

UnixWare is similar to Red Hat Linux in terms of client administration, but SCO provides some Windows binaries on the server to remotely set file and directory permissions from a Windows client, as well as create and change users and their settings. SCO and Red Hat offer support for the Unix-based Network Information Service (NIS). NIS is a store for network information like logon names, passwords and home directories. This integration helps with client administration.

Handling the staples: File and print

A NOS is nothing without the ability to share file storage and printers. Novell and Microsoft collected top honors in these areas.

You can easily add and maintain printers in Windows 2000 using the print administration wizard, and you can add file shares using Active Directory management tools. Windows 2000 also offers Distributed File Services, which let you combine files on more than one server into a single share.

Novell Distributed Print Services (NDPS) let you quickly incorporate printers into the network. When NDPS senses a new printer on the network, it defines a Printer Agent that runs on the printer and communicates with NDS. You then use NDS to define the policies for the new printer.

You define NetWare file services by creating and then mounting a disk volume, which also manages volume policies.

Red Hat includes Linux's printtool utility for setting up server-connected and networks printers. You can also use this GUI to create printcap entries to define printer access.

Linux has a set of command-line file system configuration tools for mounting and unmounting partitions. Samba ships with the product and provides some integration for Windows clients. You can configure Samba only through a cryptic configuration ASCII file - a serious drawback.

UnixWare provides a flexible GUI-based printer setup tool called Printer SetUp Manager. For file and volume management, SCO offers a tool called VisionFS for interoperability with Windows clients. We used VisionFS to allow our NT clients to access the UnixWare server. This service was easy to configure and use.

Storage management

Windows 2000 provides the best tools for storage management. Its graphical Manage Disks tool for local disk configuration includes software RAID management; you can dynamically add disks to a volume set without having to reboot the system. Additionally, a signature is written to each of the disks in an array so that they can be moved to another 2000 server without having to configure the volume on the new server. The new server recognizes the drives as members of a RAID set and adds the volume to the file system dynamically.

NetWare's volume management tool, NWConfig, is easy to use, but it can be a little confusing to set up a RAID volume. Once we knew what we were doing, we had no problems formatting drives and creating a RAID volume. The tool looks a little primitive, but we give it high marks for functionality and ease of use.

Red Hat Linux offers no graphical RAID configuration tools, but its command line tools made RAID configuration easy.

To configure disks on the UnixWare server, we used the Veritas Volume Manager graphical disk and volume administration tool that ships with UnixWare. We had some problems initially getting the tool to recognize the drives so they could be formatted. We managed to work around the disk configuration problem using an assortment of command line tools, after which Volume Manager worked well.

Security

While we did not probe these NOSes extensively to expose any security weaknesses, we did look at what they offered in security features.

Microsoft has made significant strides with Windows 2000 security. Windows 2000 supports Kerberos public key certificates as its primary authentication mechanism within a domain, and allows additional authentication with smart cards. Microsoft provides a Security Configuration Tool that integrates with MMC for easy management of security objects in the Active Directory Services system, and a new Encrypting File System that lets you designate volumes on which files are automatically stored using encryption.

Novell added support for a public-key infrastructure into NetWare 5 using a public certificate schema developed by RSA Security that lets you tap into NDS to generate certificates.

Red Hat offers a basic Kerberos authentication mechanism. With Red Hat Linux, as with most Unix operating systems, the network services can be individually controlled to increase security. Red Hat offers Pluggable Authentication Modules as a way of allowing you to set authentication policies across programs running on the server. Passwords are protected with a shadow file. Red Hat also bundles firewall and VPN services.

UnixWare has a set of security tools called Security Manager that lets you set up varying degrees of intrusion protection across your network services, from no restriction to turning all network services off. It's a good management time saver, though you could manually modify the services to achieve the same result.

Stability and fault tolerance

The most feature-rich NOS is of little value if it can't keep a server up and running. Windows 2000 offers software RAID 0, 1 and 5 configurations to provide fault tolerance for onboard disk drives, and has a built-in network load-balancing feature that allows a group of servers to look like one server and share the same network name and IP address. The group decides which server will service each request. This not only distributes the network load across several servers, it also provides fault tolerance in case a server goes down. On a lesser scale, you can use Microsoft's Failover Clustering to provide basic failover services between two servers.

As with NT 4.0, Windows 2000 provides memory protection, which means that each process runs in its own segment.

There are also backup and restore capabilities bundled with Windows 2000.

Novell has an add-on product for NetWare called Novell Cluster Services that allows you to cluster as many as eight servers, all managed from one location using ConsoleOne, NetWare Management Portal or NWAdmin32. But Novell presently offers no clustering products to provide load balancing for applications or file services. NetWare has an elaborate memory protection scheme to segregate the memory used for the kernel and applications, and a Storage Management Services module to provide a highly flexible backup and restore facility. Backups can be all-inclusive, cover parts of a volume or store a differential snapshot.

Red Hat provides a load-balancing product called piranha with its Linux. This package provides TCP load balancing between servers in a cluster. There is no hard limit to the number of servers you can configure in a cluster. Red Hat Linux also provides software RAID support through command line tools, has memory protection capabilities and provides a rudimentary backup facility.

SCO provides an optional feature to cluster several servers in a load-balancing environment with Non-Stop Clustering for a high level of fault-tolerance. Currently, Non-Stop Clustering supports six servers in a cluster. UnixWare provides software RAID support that is managed using SCO's On-Line Data Manager feature. All the standard RAID levels are supported. Computer Associates' bundled ArcServeIT 6.6 provides backup and restore capabilities. UnixWare has memory protection capabilities.

Documentation

Because our testing was conducted before Windows 2000's general availability ship date, we were not able to evaluate its hard-copy documentation. The online documentation provided on a CD is extensive, useful and well-organized, although a Web interface would be much easier to use if it gave more than a couple of sentences at a time for a particular help topic.

NetWare 5 comes with two manuals: a detailed manual for installing and configuring the NOS with good explanations of concepts and features along with an overview of how to configure them, and a small spiral-bound booklet of quick start cards. Novell's online documentation is very helpful.

Red Hat Linux comes with three manuals - an installation guide, a getting started guide and a reference manual - all of which are easy to follow.

Despite being the most difficult product to install, UnixWare offers the best documentation. It comes with two manuals: a system handbook and a getting started guide. The system handbook is a reference for conducting the installation of the operating system. It does a good job of reflecting this painful experience. The getting started guide is well-written and well-organized. It covers many of the tools needed to configure and maintain the operating system. SCO's online documentation looks nice and is easy to follow.

Wrapping up

The bottom line is that these NOSes offer a wide range of characteristics and provide enterprise customers with a great deal of choice regarding how each can be used in any given corporate network.

If you want a good, general purpose NOS that can deliver enterprise-class services with all the bells and whistles imaginable, then Windows 2000 is the strongest contender. However, for high performance, enterprise file and print services, our tests show that Novell leads the pack. If you're willing to pay a higher price for scalability and reliability, SCO UnixWare would be a safe bet. But if you need an inexpensive alternative that will give you bare-bones network services with decent performance, Red Hat Linux can certainly fit the bill.

The choice is yours.

Bass is the technical director and Robinson is a senior technical staff member at Centennial Networking Labs (CNL) at North Carolina State University in Raleigh. CNL focuses on performance, capacity and features of networking and server technologies and equipment.

RELATED STORIES:

Debate will focus on Linux vs. LinuxJanuary 20, 2000Some Windows 2000 PCs will jump the gunJanuary 19, 2000IBM throws Linux lovefestJanuary 19, 2000Corel Linux will run Windows appsJanuary 10, 2000Novell's eDirectory spans platformsNovember 16, 1999New NetWare embraces Web appsNovember 2, 1999Microsoft sets a date for Windows 2000October 28, 1999

RELATED IDG.net STORIES:

Fusion's Forum: Square off with the vendors over who has the best NOS(Network World Fusion)How we did it: Details of the testing(Network World Fusion)Find out the tuning parameters(Network World Fusion)Download the Config files(Network World Fusion)The Shootout results(Network World Fusion)Fusion's NOS resources(Network World Fusion)With Windows 2000, NT grows up(Network World Fusion)Fireworks expected at NOS showdown(Network World Fusion)

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Novell, Inc.Microsoft Corp.The Santa Cruz Operation, Inc. (SCO)Red Hat, Inc.

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