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RAID 5, as shown in figure 2.4, requires at least three disks. It addresses the low disk utilization inherent with RAID 1 by using parity to provide redundancy rather than
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storing a duplicate copy of the data on another disk. When a disk failure occurs in a RAID 5 array, the data stored on that disk is dynamically recovered using the parity information on the remaining disks.
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Figure 2.4 Each write to a RAID 5 partition involves multiple reads to calculate and store parity information. For SQL Server systems with substantial write activity, RAID 5 is often a poor choice. (Image provided courtesy of Advanced Computer and Network Corp.)
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Selecting the appropriate RAID level
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Disk utilization in RAID 5 is calculated as # of drives-1/# of drives. For three disk volumes, the utilization is 66 percent, for five disk volumes, 80 percent, and so forth. RAID 5 s main advantage is higher disk utilization than RAID 1, and therefore a lower overall storage cost; however, the downsides are significant. Each write to a RAID 5 array involves multiple disk operations for parity calculation and storage; therefore, the write performance is much lower than other RAID solutions. Further, in the event of a disk failure, read performance is also degraded significantly. Such overhead makes RAID 5 unsuitable for a lot of SQL Server implementations. Exceptions include installations with either predominantly read-only profiles or those with disk capacity or budgetary constraints that can handle the write overhead.
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RAID 10 combines the best features of RAID 1 and 0, without any of the downsides of RAID 5. Also known as RAID 1+0, RAID 10 is the highest performance RAID option. As shown in figure 2.5, RAID 10 offers the high-performance striping of RAID 0 with the fault tolerance of RAID 1 s disk mirroring without any of the write overhead of RAID 5.
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Figure 2.5 RAID 10 combines the benefits of mirroring and striping while avoiding the parity overhead of RAID 5. As such, a RAID 10 partition provides excellent performance and redundancy at the expense of higher cost. (Image provided courtesy of Advanced Computer and Network Corp.)
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The downside of RAID 10 is the cost. Requiring at least four disks, RAID 10 arrays benefit from lots of disks to stripe across, each of which requires a mirror partner. In large deployments, the cost of RAID 10 may be prohibitive for some organizations, with the money perhaps better spent on other infrastructure components. RAID 10 offers the most advantages to SQL Server and, despite the cost, should be seriously considered for environments requiring both high performance and fault tolerance. Table 2.1 compares RAID 10 with RAID 0, 1, and 5.
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Table 2.1 RAID level comparisons RAID 0 0 100% High High Bad RAID 1 >=1 50% High Medium Good 1 66%+ High Low Limited RAID 5 RAID 10 >=1 50% High Medium Good
Attribute Disk failure tolerance Disk utilization % Read performance Write performance SQL Server suitability
Storage system sizing
Finally, it s worth mentioning that RAID can be implemented at either the software level, via the Windows operating system, or the hardware level, using dedicated RAID controller cards. Software RAID shouldn t be used in server class implementations as doing so consumes operating system resources and doesn t offer the same feature set as hardware implementations. Hardware RAID requires no operating system resources and provides additional benefits, such as more RAID-level options, battery- backed disk cache (covered in chapter 3), and support for swapping out failed disks without bringing down the system. Let s move on now and cover the different types of storage systems available today.
Selecting an appropriate storage system
In addition to DAS, recent years have seen the introduction of a number of other types of storage solutions. As well as DAS, this section will investigate Fibre Channel and iSCSI SANs. We ll explore their advantages and disadvantages for use in SQL Server systems from various perspectives, including performance, cost, manageability, and disaster recovery.
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