HP StorageWorks XP48 - Disk Array Owner's Manual page 104

104
HOST
D2
D1 D3
D1 D2 D3
D5 D6 P
(4-6)
D9 P D7
(7-9)
P D10 D11
(10-12)
Disk 1 Disk 2 Disk 3
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
P D2
(RAID5)
(1-3)
P D1
(1-3)
D4 M2
D8
D5
D12
M6
Disk 4 Disk 1
HP SureStore E Disk Array XP512/XP48: Owner's Guide
HOST
D2
DKC
RAID 0/1
M1 D3 M3
D2 M4 D4
M5 D7 M7
D6 M8 D8
Disk 2 Disk 3 Disk 4