HP SureStore E Disk Array XP512/XP48 Owner's Guide

104

HP SureStore E Disk Array XP512/XP48: Owner’s Guide

Figure 18. Data Reconstruction After Drive Error

There are two data integrity features built into the XP512: dynamic sparing

and correction copy. The XP512 uses spare disk drives and reconfigures

any drives that are blocked because of errors or whose error count exceeds

a specified limit value.

Since this processing is done in the background, the array can continue to

accept host I/O requests. The data saved on spare disks is copied back into

the original location after the drive with errors has been replaced with a

new one.

DKC

(RAID5)

M8D6 D8M6

M7D5 D7M5

M4D2 D4M2

M3D1 D3M1

P(10-12) D11D10 D12

P(7-9) D7D9 D8

P(4-6)D6D5 D4

P(1-3)D1 D2 D3

DKC

RAID 0/1

Disk 1 Disk 2 Disk 3 Disk 4 Disk 1 Disk 2 Disk 3 Disk 4

D1 D3 P(1-3)

HOST