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Test Code : VCS-253
Test appellation : Administration of Veritas Cluster Server 6.0 for UNIX
Vendor appellation : Veritas
: 235 real Questions
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To compose sure, the expertise is struggling a picture problem,many VARs suppose of it as it became in its early days. lower back then, clustering applied sciences had been effortlessly mating two servers together. The servers ran the selfsame OS, used the identical hardware configuration and helped to maneuver hardware failures gracefully. but today, as internet and database purposes acquire multiplied in visibility, clustering is plenty less monogamous and,subsequently,greater exciting, provocative and difficult for solution suppliers.
these changes acquire Come about because of two mighty forces: purposes acquire turn into greater mindful and able to clustering technologies, and applications companies acquire turn into more dissatisfied with the pace of innovation around clustering on Intel/notebook hardware and Microsoft home windows OS application. as a result, clustering has branched out past simply the OS and is now dealt with directly through many essential functions, such as Oracle databases, and by storage carriers, similar to Veritas.
"shoppers' needs are different, and they requisite complete these different techniques," says Arun Taneja, a senior analyst at analyst company trade Storage group, Milford, Mass.
Clustering PrimerAt its coronary heart, clustering is a really basic thought, however with lots of advanced subtleties that can bedevil the savviest VAR: Tie collectively two or extra servers with quite a lot of hardware and application tools and hints, and permit them to hold operating if any one ingredient fails. Clustering actually encompasses a few discrete notions. First and most useful is unreasonable availability. That capacity that there is not any single ingredient of failure, and sometimes an excellent deal greater developed-in redundancy if more than one allotment fails. allotment of the thought of towering availability includes failover and failback healing. If a component fails, the relaxation of the cluster continues to operate, and once the failed allotment is brought again online, the newly fixed system can moreover be brought back in synch with the relaxation of the cluster.
solution providers today acquire their alternative of clustering methods, but they even acquire the accountability to bone up on these new technologies and strategies of helping more undoubted purposes. For providers to be constructive, they may should alternate their own loyalties, remixing their items, platforms and programs to leverage the brand new breeds of clustered purposes. To play in this space, providers will requisite to turn into more proactive in marrying clustering options with their consumers.
At its core, clustering includes the duplication of pretty much every computer element,from disk drives to processors to community adapters. In case one particular fails, the working twin (or triplicate, or quadruplicate, depending on how many replicated servers are allotment of the cluster) soldier on, without the applications missing a beat.
"Clustering is foremost for a database-pushed software as a result of synchronization concerns concerning redundancy," says Capel English, CTO of SNAPS, an integration company specializing in significant-scale fax-server methods that consist of clustering.
it truly is why it be got so a lot purchase-in from huge vendors, together with Oracle. Oracle's clustering technology "has taken us more than 10 years to advance and is a step forward within the industry," says Robert Shimp, vice president of database marketing for Oracle. "it be making a revolution in the trade. loads of carriers are coming out with clustering solutions. Clustering drops the can permeate of computing dramatically, along with dramatically enhancing purposes' reliability. It moreover makes Linux a lots more plausible option in trade computing."
returned in its monogamous days, clustering become strictly the province of the OS: You needed specialized types of Unix and home windows to be capable of help redundant, tightly coupled file servers and maneuver hardware failures devoid of losing data or individual transactions.
but as net and database applications acquire grown in prominence, so, too, has the requisite for specialised functions-layer clustered solutions, and those acquire begun to complicate the want for OS-layer clustered services. The subject, of path, is the information. preserving it intact, synchronized and accessible in case of a failed allotment has become extra tangled as web, database and applications servers engage and share assistance. The OS-layer clusters can not retain song of individual transactions, as a result of they operate on gross-file ranges. That makes clustering a tougher avow for resellers and integrators to install.
Clustering is more than just parallel processing or its latest incarnation known as server blades,servers on add-in cards that add multiprocessing horsepower. Such strategies marry a number of computers collectively for selected functions and acquire develop into extra common as hardware costs drop.
"we acquire seen that on the low conclusion of the market, where individuals are relocating towards ganging collectively a bunch of commodity computers and spreading the workload over them," says Dan Kusnetzky, researcher IDC's vice president of rig software analysis. "Of route, you acquire to be capable of spoil up your software into divide items and then assemble the effects collectively. this may lower the permeate of hardware and exercise decrease-cost licenses or open source and accept the identical work done for a lessen budget."
a more in-depth LookClustering encompasses numerous situations, in line with analysts and companies (see "allow us to import number the techniques," web page 32). Storage and applications-connected clustering usathe ante for both integrators and shoppers. "Clustering is a logical extension of primary redundancy. They wouldn't typically seize a consumer to that stage except they'd the basics already in place,strong backup, distinctive NICs in each server, dissimilar switches, remedy vigour coverage etc," says Neil Rosenberg, CEO at property know-how options, South Orange, N.J., a network integrator providing clustering solutions to midsize agencies in the metro manhattan location.
"in spite of the fact that the technology for hardware clustering has been around for years, it has now not been adopted by means of medium to small agencies. utility programmers understand small about hardware and attain not understand a way to design for clustering," says Hal Lavender, chief architect at Cognizant applied sciences, a leading company of customized-software building.
The refocusing of clustering on purposes has took state for other explanations as well, two of which consist of the older OS clustering models falling victim to unreasonable pricing and their restrained functions assist.
When it comes to clustering, rate is a controversy. There are more suitable and cheaper options to featuring fault-tolerant functions than clustering accessible from Microsoft or versions of Unix from HP/Compaq, sun and others. One example is the LifeKeeper application product from SteelEye, which runs on each Unix and home windows and may supply support for a number of distinctive applications. An alternative on the hardware aspect is the specific line of fault-tolerant servers from NEC that rush windows 2000 and can be create in configurations for only $25,000.
"&#ninety one;the brand new HP makes it very convenient to accept begun with their CL380 packaged cluster bundle," says Rosenberg, who sells numerous this configuration to midsize companies. "it's a superb avow for shoppers trying to find gigantic disk faculty and server failover with home windows 2000 Server or with NetWare 6.
but expense is rarely the most effective difficulty. "we're seeing only a few purposes that are cluster-mindful," says Doug Garcia, vice chairman of revenue at QuestingHound, an avow issuer based mostly in Lighthouse aspect, Fla., that concentrates on safety and networking capabilities. inserting clustering services inner the OS does not compose a lot feel unless those services can aid a wide variety of functions devoid of too an substandard lot effort. And therein lies the rub, since the endeavor to compose functions cluster-mindful is odious, requiring the exercise of special scripts, programming interfaces or different techniques which are most effective for essentially the most experienced builders.
it's where Oracle's perquisite utility Cluster (RAC) comes into play. RAC still requires clustered OSs and storage options, so it's an addition,now not a replacement,to those technologies. however the key here is that it runs complete present Oracle purposes without any modification, and offers a layer of redundancy and scalability that isn't workable with simply OS and storage-clustering solutions. "RAC runs with any packaged app on the earth, and it runs across the board on various OSs," Oracle's Shimp says. "it is why customers care. they now acquire a whole bunch of customers the usage of this for massive functions. it's a really subtle piece of software and RAC offers massive discounts if you betide to compare it with the cost of a multiprocessing system."
home windows Vs. UnixMicrosoft has had three major complications with clustering and has been 2nd to the a lot of Unix carriers. First, Microsoft windows has lagged in the back of Unix in terms of supporting varied-machine clusters. second, it has no longer protected clustering aid for a lot of purposes into windows, beside its personal servers, equivalent to SQL Server, trade and information superhighway information Server. Third, even with usher for its own servers, integrators still needed to compose modifications to purposes to compose them cluster-mindful.
"When it involves sophistication in clustering application, Microsoft is a babe within the woods," Taneja says. "folks relish Veritas, Legato, IBM and sun are an substandard lot extra subtle,they can maneuver sixteen or 32 clustered servers, and acquire had more than eight server types accessible for two or three years, whereas Microsoft is barely popping out with this assist later this year," he says.
"Our clustering memoir needs to be enhanced," says Stan Sorensen, director of SQL Server advertising for Microsoft. "we acquire a advertising vicissitude and a few work to attain there, however they now acquire an excellent foundation on which to construct. obviously, they recognize they can compose it enhanced,we are looking to be in a position to scale as much as multiple laptop clusters. they are definitely constrained by using state-of-the-art hardware."
Many resellers and integrators agree: "If an conclusion person definitely wants clustering, they deserve to be using Unix or Linux for allotted processing," Garcia says. Oracle's Shimp moreover recommends Linux. "Linux dramatically lowers the cost of hardware and nevertheless achieves a Great pleasant of provider. Linux is extremely eye-catching for clustering."
To compose matters greater complicated, diverse types of windows support discrete configurations and numbers of nodes per cluster (see "Microsoft Clustering Specs," correct). youngsters, Microsoft has made issues a small bit more convenient with the greater recent models of home windows. "windows load-balancing capabilities in advanced Server made it perquisite convenient to accept issues install. You should not acquire to be a rocket scientist to configure this," says Tom Rizzo, community product manager for SQL Server at Microsoft. "All Microsoft servers such as change, web suggestions Server and SQL Server assist clustering," he says.
included in complete copies of home windows 2000 are the programming interfaces for clustering, so developers can write clustered purposes on any Win2k version. despite the fact, they can simplest install them on either advanced or Datacenter Server types.
Keys To Clustering"Clustering forces their builders to acquire some capabilities of the hardware ambiance and the administration staff to be aware fundamental architectural and software-design parameters," Cognizant's Lavender says. "as an instance, network administrators ought to be extra careful about designing directories and how failovers turn up from one machine to one other."
Scalability is subsequent. Having numerous servers skill which you can share their computing vigor and equilibrium the just processing load. notice that here's different from multiprocessing servers that contain a number of CPUs in a single cabinet: The clusters comprise as a minimum two divide machines. Some clustering features usher up to eight or extra individual nodes. but having greater nodes is rarely complete the time a much better deal: "In their environment, greater than two nodes would not in fact buy you anything else," English says.
Third is the potential to manage the cluster as a single entity. conclusion users, and functions and community administrators can acquire a single point of maneuver over the cluster. There are numerous parameters, such as how the particular person nodes of the cluster are connected together; even if the cluster is homogeneous in order that each computing device is an exact replica when it comes to processor, community adapter and different configuration details; and even if any particular application is required on every network client to access the clustered resources. Any management scheme will should hold in reason those diversifications.
eventually, clustering style is vital. A cluster can share a single disk array, in order that multiple copies of the equal software (corresponding to a database or internet server) acquire entry to the identical file device. Or each and every node within the cluster can seize ownership of its own disk supplies. Clusters can moreover be connected collectively the usage of commonplace Ethernet cabling, a shared SCSI bus to connect disk
drives to distinctive servers, or a committed deepest link among the many servers besides the community connection (see "basic Clustering bill-of-materials record," web page 36). a typical cluster can moreover be energetic/lively, that means that divide copies of the software are operating at the selfsame time as on complete nodes of the cluster. If one node fails, the application will continue seamlessly and be picked up with the aid of the different nodes. on the other hand, clusters will moreover be lively/passive, which means that only 1 node of the cluster is operating the application while the others operate as scorching spares.
how you configure your cluster is subject upon cost and the residences of your underlying OS and applications: Some combos only usher one class of configuration.
"Some consumers don't relish the concept of the passive node sitting there doing nothing however awaiting the lively node to fail over," English says. Passive configurations "require that you just purchase twice as lots hardware as you requisite to aid your creation atmosphere," Lavender says. "That capacity it's invariably cost-prohibitive and seldom used."
solution-provider ConcernsSuch issues compose clustering a difficult sell for solution providers. They should learn the way to specify, configure, set up and usher clusters. That requires a superb deal of up-entrance effort, and continuing schooling as clustering evolves in the course of the years.
now and again, the margins don't appear to be extensive ample to warrant this variety of effort: "Hardware and software are very nearly commodities," Rosenberg says. "The work,and the income,is in the design and integration services." That means that integrators relying just on hardware income are going to acquire a troublesome time making any cash promoting clustered options, until they consist of expenses for his or her services as a allotment of the kit.
numerous practicing classes are available that may help
integrators. "With the perquisite substances, and for a common installing, an skilled, mighty engineer can settle upon this up and rush with it. They used several books and a three-day Microsoft/Compaq practising session held in the neighborhood to surge up to speed on clustering," Rosenberg says.
Such practicing is basic as a result of the really expert nature of clustering. "Most valued clientele are either without the really expert journey and skill levels, or acquire the skill onboard however can not spare them from other crucial areas," Garcia says.
"Many clients don't appear to be prepared for the complexity and help considerations of clustered purposes. You must seize it on an software-by way of-software basis, and find out about licensing necessities, really edifying drivers and interfaces, and any enhancements which are mandatory," he says. "in many cases, their funds can be more desirable spent on excessive-availability servers reminiscent of NEC's failing Tolerant Platform. About ninety five % of the requests they accept for clustering are only for prime-availability servers, and we'd fairly suggest a fault-tolerant solution that has less complicated implementation and reduce can permeate of possession."
Veritas And OracleFinally, VARs can travel the route of the exercise of clustering provided by means of the software companies themselves,both leading carriers are Veritas and Oracle. Cluster Server from Veritas supports a huge orbit of home windows and Unix clusters and storage configurations. Lavender is a great fan of Veritas' clustering software on each Unix and home windows.
"Veritas' providing is both vendor-impartial and packed with points that always meet the wants of any software," he says. "although, Microsoft's Clustering carrier remains in its infancy."
"software clustering allows for users to resubmit a transaction and acquire it processed consistently on the different nodes in the cluster automatically after a failure happens," Lavender says. "software clustering can perpetually be configured to deliver load-balancing between circumstances/nodes so in common operation, load-balancing will moreover be used to help basic gadget throughput. Hardware clustering, however, ensures that after a quick length,customarily a couple of seconds to a few minutes,that transaction can once again be processed."
Oracle's RAC items a single database image for any purposes, yet handles failover and failback situations. "It has best been on the market for about a yr, and a small percent of their shoppers are the exercise of it," Oracle's Shimp says. "whereas the uptake is small, it is encouraging to us." And, not relish Microsoft's clustering answer, RAC doesn't require any amendment to present applications. "You can't in reality rush any clustered purposes with SQL Server; you possibly can should compose a customized application to compose clustering work," he says.
Of course, there are downsides, as smartly. "Oracle's RAC is awfully problematic to deploy and not every utility must be done that method," Taneja says. "RAC makes sense for aiding one gigantic database and if you betide to want to be certain that you've got two or greater servers to give enhanced performance."
No remember which way an integrator goes on clustering,functions or OS,it continues to be a tough promote and will seize some endeavor to assist. however resellers who can marry the remedy solution will discover that clustering can moreover be a ecocnomic source of profits, and find that these marriages could acquire staying energy as their purchasers proceed to develop their applications.
"To implement clustering has required comparatively cheap advantage,if you're a VAR, you are going to acquire to truly give charge and understand what you're doing," Taneja says. "because it is complicated, those VARs that seize note these concerns can accept paid fairly a small bit of cash, because the clustering customer can
actually exercise that aid.
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