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All levels of RAID, except RAID 0, provide higher availability than a single drive. However, if availability is expanded to also include the overall performance level during failure mode, some RAID levels provide de nite advantages over others. Speci cally, RAID 1 and its derivatives, RAID 10 and RAID 0+1, provide enhanced availability when compared to RAID levels 3, 4, 5, and 6 during failure mode. The performance degradation is minimal when compared to a single disk if one half of a mirror fails, whereas a RAID 5 or RAID 6 array has substantially compromised performance until the failed disk is replaced and the array is rebuilt. In addition, RAID systems that are based on an array of arrays can provide higher availability than RAID levels 1 through 6. Running on multiple controllers, these arrays are able to tolerate the failure of more than one disk and the failure of one of the controllers, providing protection against the single point of failure inherent in any single-controller arrangement. RAID 1 that uses duplexed disks running on different controllers as opposed to RAID 1 that uses mirroring on the same controller also provides this additional protection and improved availability. Hot-swap drives and hot-spare drives (discussed later in this chapter) can further improve availability in critical environments, especially hot-spare drives. By providing for automatic failover and rebuilding, they can reduce your exposure to catastrophic failure and provide for maximum availability.
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The relative performance of each RAID level depends on the intended use. The best compromise for many situations is arguably RAID 5 or RAID 6, but you should be suspicious of that compromise if your application is fairly write-intensive. Especially for relational database data and index les where the database is moderately or highly write-intensive, the performance hit of using RAID 5 or RAID 6 can be substantial. A better alternative is to use RAID 0+1 or RAID 10. Whatever level of RAID you choose for your particular application, it will bene t from using more small disks rather than a few large disks. The more drives contributing to the stripe of the array, the greater the bene t of parallel reading and writing you ll be able to realize and your array s overall speed will improve.
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The delta in cost between RAID con gurations is primarily the cost of drives, potentially including the cost of additional array enclosures because more drives are required for a particular level of RAID. RAID 1 either duplexing or mirroring is the most expensive of the
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conventional RAID levels because it requires at least 33 percent more raw disk space for a given amount of net storage space than other RAID levels. Another consideration is that RAID levels that include mirroring or duplexing must use drives in pairs. Therefore, it s more dif cult (and more expensive) to add on to an array if you need additional space on the array. A net 144-gigabyte (GB) RAID 0+1 array, comprising four 72-GB drives, requires four more 72-GB drives to double in size, a somewhat daunting prospect if your array cabinet has bays for only six drives, for example. A net 144-GB RAID 5 array of three 72-GB drives, however, can be doubled in size simply by adding two more 72-GB drives for a total of ve drives. RAID arrays based on 2.5-inch drives are rapidly replacing traditional 3.5-inch drives. The smaller 2.5-inch drives take up less physical space for the same amount of total storage, while consuming substantially less power and generating less heat. The initial cost of the array is essentially similar to that of an equivalent array using 3.5-inch drives, but the ongoing costs are less. Our current preferred array system uses eight 2.5-inch SAS drives con gured as RAID 0+1. The entire array ts in the space of a pair of standard CD/DVD drives in our HP ML350 tower.
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