HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 Service Manual (A5 - Page 55
RAID Level Comparisons, Table 1
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Product Description RAID Level Comparisons To help you decide which RAID level to select for a volume group, the following tables compare the characteristics for the supported RAID levels. Where appropriate, the relative strengths and weakness of each RAID level are noted. Table 1 RAID Level Comparison: Data Redundancy Characteristics RAID Level Disk Striping Mirroring Parity Handle multiple disk failures? RAID 0 Yes RAID 1 No RAID 0/1 Yes RAID 3 Yes RAID 5 Yes No No No. RAID 0 offers no data redundancy or protection against disk failure. Yes No No Yes No Yes, providing both disks in a mirrored pair do not fail. No Yes No No Yes No Table 2 RAID Level Comparison: Storage Efficiency Characteristics 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 volume group is required to store parity data. As the number of disks in the volume group increases, so does the storage efficiency. 3-disk volume group: 66% 4-disk volume group: 75% 5-disk volume group: 80% 6-disk volume group: 83% Disk Array High Availability Features 55