HP Surestore Disk Array 12h and FC60 - Manual (Page 63)

Disk Array High Availability Features 63
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Figure 23 Rebuild Process on a RAID 5 LUN (or Volume Group)
The information on the hot spare is
copied to the replaced disk, and the
hot spare is again available to protect
against another disk failure.
Data and parity from the
remaining disks are used to
rebuild the contents of disk 3
on the hot spare disk.