Compex Systems Advanced SerialRAID Adapters SA33-3285-02 - Manual (Page 67)

If pdisk2 fails, the hot spare disk drive pdisk4 might replace pdisk 2 as one of the
primary disk drives in the array, as shown in Figure 17.
Now, assume that for some reason, the disk drives in building 2 are no longer available.
The example array is now in the Offline state because one of its four primary disk
drives is in building 2. Only the three primary disk drives that are in building 1 are
operational.
Primary Disks
Building 1 Building 2
pdisk1
(Spare)
pdisk3 pdisk2
(Failed)
pdisk10 pdisk11
A
D
A
P
T
E
R A
D
A
P
T
E
R
pdisk12
pdisk4 pdisk6 pdisk5
pdisk7 pdisk8 pdisk9
Secondary Disks
Figure 17. Primary Disk in Building 1; Secondary Disks in Building 2; Distributed Spares
Chapter 5. Hot Spare Management 47