HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 Service Manual (A5 - Page 51
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Product Description of the pair. If both disks fail or become inaccessible simultaneously, the data on the volume group becomes inaccessible. Figure 20 illustrates the distribution of data in a four-module RAID 0/1 volume group. The disk block addresses in the stripe proceed sequentially from the first pair of mirrored disks (disks 1 and 2) to the second pair of mirrored disks (disks 3 and 4), then again from the first mirrored disks, and so on. Figure 20 RAID 0/1 Volume Group RAID 3 RAID 3 uses parity to achieve data redundancy and disk striping to enhance performance. Data is distributed across all but one of the disks in the RAID 3 volume group. The remaining disk is used to store parity information for each data stripe. A RAID 3 volume group consists of three or more disks. For highest availability, the disks in a RAID 3 volume group must be in different enclosures. If a disk fails or becomes inaccessible, the disk array can dynamically reconstruct all user data from the data and parity information on the remaining disks. When a failed disk is replaced, the disk array automatically rebuilds the contents of the failed disk on the new Disk Array High Availability Features 51