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Figure 8.2 Fibre Channel arbitrated loop.
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Whether the Fibre Channel is arranged in a loop, a fabric, or a combination of the two, it still functions as a network. Since SAN technology is relatively new and standards have not been widely adopted, the components can be extremely expensive, although prices have begun to drop in recent times. We have seen cases where the cost of a host bus adapter (HBA, the card that plugs into a server allowing it to connect to a SAN) costs more than the whole server. The networking components that sit on the SAN, including hubs and switches, can also be prohibitively expensive. Costs will continue to fall over the next few years, but in the meantime, SANs will continue to be a significant expense for most organizations.
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Why SANs
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Several significant benefits can be realized through the proper implementation of storage area networks. The following are some of these benefits:
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Storage centralization and consolidation Sharing storage Reduced network loads Faster backups Improved data access
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Let s take a brief look at each of these.
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Storage Centralization and Consolidation
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Storage requirements have grown at dramatic rates over the last few years, as applications like email, file sharing, and web services have become more and more prevalent. As each of these applications become more widely used, in fact, each pushes the use of even more storage (for example, as more people use email, the amount of email that is sent to each email user increases). As a result, each host on a network must be connected to more and more individual disks. In order to effectively manage this growth, many system administrators have chosen to centralize and consolidate their storage, as it is easier to manage pooled storage and a smaller number of larger storage arrays than it is to manage lots of small islands of storage scattered around an enterprise. As storage needs continued to change, and storage had to be reallocated from one host to another, administrators quickly learned how difficult it was to move this storage around. SANs allow storage to be placed into a centralized pool that can be easily allocated and reallocated between the hosts on that SAN. Administrators may have purchased enough storage, only to find that it has been connected to the wrong server. They no longer have to tell their managers that even though there is an unused terabyte of storage on that host,
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SAN, NAS, and Virtualization
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bonnie, we need to buy another terabyte so that we can have it for this host, clyde. With a SAN, the unused terabyte can be reallocated, entirely through software, from bonnie to clyde. When storage is physically (or at least logically; SANs do not require all the storage to be physically colocated for it to be centrally managed) centralized, it can be administered from a central console, by a small team of administrators, often just one administrator. Centralized storage can also be backed up more easily to a centrally located set of SAN-capable tape drives or disks. The result of both of these centralizations is a reduction in complexity (complexity is, of course, the sworn enemy of high availability) and in management costs, freeing up resources for other projects. SAN management is often performed with the combination of a whiteboard in the system administrator s office and a spreadsheet. Often, the information on the whiteboard and in the spreadsheet are not up-to-date, and sometimes they completely contradict each other. Modern SAN management software eliminates the need to use these old-fashioned tools, replacing them with modern methods that can build and maintain a full-blown database, and that can discover new storage and new hosts as they are added to the SAN, simplifying management even further. One problem that has plagued SANs in recent years is that there are so many different vendors, each offering different products and components, with different revision levels. The result is a morass of combinations and permutations that ensure that virtually no two SANs have exactly the same combination of hardware, firmware, and software, and that nobody could possibly have tested all of the combinations. In many cases, the combinations are not only untested, but they genuinely don t work. The introduction of just one bad component can cause problems across the entire SAN in totally new and unexpected ways that can be extremely difficult to isolate. The promise of SANs cannot be fully realized until the vendors can develop a basic set of standards that allow all of the different vendors to play together. We sincerely hope that by the time you read these words most of these compatibility problems have been solved.
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