HP Surestore Disk Array FC60 Disk Array FC60 User's Guide (A5277A) - Page 46
RAID Level, Disk Striping, Mirroring, Parity, Handle multiple disk, failures?, Storage Efficiency
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RAID Level Disk Striping Mirroring RAID 0 Yes No RAID 1 No Yes RAID 0/1 Yes Yes RAID 3 Yes No RAID 5 Yes No Parity No No No Yes Yes Handle multiple disk failures? No. RAID 0 offers no data redundancy or protection against disk failure. RAID 0 should only be used for noncritical data. The failure of a single disk in a RAID 0 LUN will result in the loss of all data on the LUN. No Yes, providing both disks in a mirrored pair do not fail. No No RAID Level Storage Efficiency RAID 0 100%. All disk space is use for data storage. RAID 1 and 0/1 50%. All data is duplicated, requiring twice the disk storage for a given amount of data capacity. RAID 3 and 5 One disk's worth of capacity from each LUN is required to store parity data. As the number of disks in the LUN increases, so does the storage efficiency. 3-disk LUN: 66% 4-disk LUN: 75% 5-disk LUN: 80% 6-disk LUN: 83% 46