HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 51
Raid 1,
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Product Description fails. RAID-0 provides enhanced performance through simultaneous I/Os to multiple disk modules. Software mirroring the RAID-0 group provides high availability. Figure 18 illustrates the distribution of user and parity data in a four-disk RAID 0 LUN. The the stripe segment size is 8 blocks, and the stripe size is 32 blocks (8 blocks times 4 disks). The disk block addresses in the stripe proceed sequentially from the first disk to the second, third, and fourth, then back to the first, and so on. Figure 18 RAID 0 LUN RAID 1 RAID 1 uses mirroring to achieve data redundancy. RAID 1 provides high availability and good performance, but at the cost of storage efficiency. Because all data is mirrored, a RAID 1 LUN has a storage efficiency of 50%. A RAID 1 LUN consists of exactly two disks configured as a mirrored pair. One disk is the data disk and the other is the disk mirror. The disks in a RAID 1 LUN are mirrored by the disk array hardware, which automatically writes data to both the data disk and the disk mirror. Once bound into a RAID 1 mirrored pair, the two disks cannot be accessed as Disk Array High Availability Features 51