RAID 10 characteristics:• Groups n disks as one large virtual disk with a capacity of (n/2) disks, where n is an even integer.• Mirror images of the data are striped across sets of physical disks. This level provides redundancy through mirroring.• When a disk fails, the virtual disk still works. The data is read from the surviving mirrored disk.• Improved read performance and write performance.• Redundancy for protection of data.Comparing RAID level performanceThe following table compares the performance characteristics associated with the more common RAID levels. This table providesgeneral guidelines for choosing a RAID level. Evaluate your specific environment requirements before choosing a RAID level.Table 34. RAID level performance comparisonRAID Level Data Availability ReadPerformanceWritePerformanceRebuildPerformanceMinimum DisksRequiredSuggestedUsesRAID 0 None Very Good Very Good N/A N Noncritical data.RAID 1 Excellent Very Good Good Good 2N (N = 1) Small databases,database logs,and criticalinformation.RAID 5 Good Sequentialreads: good.Transactionalreads: Very goodFair, unless usingwriteback cacheFair N + 1 (N = atleast two disks)Databases andother readintensivetransactionaluses.190
