Hp Surestore Disk Array 12h and FC60 Instrukcja Użytkownika Pobierz pdf (Strona 53)

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Disk Array High Availability Features 53

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pair. For highest data availability, each disk in the mirrored pair must be located in a

different enclosure.

When a disk fails, the disk array automatically uses the remaining disk of the mirrored pair

for data access. A RAID 0/1 LUN can survive the failure of multiple disks, as long as one

disk in each mirrored pair remains accessible. Until the failed disk is replaced (or a rebuild

on a global hot spare is completed), the LUN operates in degraded mode. While in degraded

mode, the LUN is susceptible to the failure of the second disk of the pair. If both disks fail

or become inaccessible simultaneously, the data on the LUN becomes inaccessible.

Figure 20 illustrates the distribution of data in a four-module RAID 0/1 LUN. 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

LUN

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 LUN. The remaining disk is

used to store parity information for each data stripe. A RAID 3 LUN consists of three or

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 465 466

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Hp Surestore Disk Array 12h and FC60 Instrukcja Użytkownika Strona 53

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