HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 50
RAID Levels, RAID 0
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using a 5-disk RAID 5 LUN, a stripe segment size of 32 blocks (16 KB) would ensure that an entire I/O would fit on a single stripe (16 KB on each of the four data disks). The total stripe size is the number of disks in a LUN multiplied by the stripe segment size. For example, if the stripe segment size is 32 blocks and the LUN comprises five disks, the stripe size is 32 X 5, or 160 blocks (81,920 bytes). RAID Levels RAID technology uses a number of different techniques for storing data and maintaining data redundancy. These industry-standard RAID levels define the method used for distributing data on the disks in a LUN. LUNs that use different RAID levels can be created on the same disk array. The Disk Array FC60 supports the following RAID levels: • RAID 0 • RAID 1 • RAID 0/1 • RAID 3 (Windows NT and Windows 2000 only) • RAID 5 RAID 0 CAUTION RAID 0 does not provide data redundancy. It should only be used in situations where high performance is more important than data protection. The failure of any disk within a RAID 0 LUN will cause the loss of all data on the LUN.. RAID 0 should only be used for non-critical data that could be lost in the event of a hardware failure. RAID 0 uses disk striping to achieve high performance. Data is striped across all disk in the LUN. The ability to access all disks in the LUN simultaneously provides a high I/O rate. A RAID 0 group configuration for a logical disk unit offers fast access, but without the high availability offered by the other RAID levels. Unlike other RAID levels, RAID 0 does not provide data redundancy, error recovery, or other high availability features. Consequently it should not be used in environments where high-availability is critical. All data on a RAID 0 LUN is lost if a single disk within the LUN 50 Disk Array High Availability Features