Fujitsu primequest 2400E2 Design Manual page 76

3.2.3 Switching Reserved SB Rules (2/5)
When an SB Is Set as a Reserved SB for Multiple Partitions

If multiple SBs in different partitions fail simultaneously, the Reserved SB is
used to replace the failed SB in the partition with the lowest partition number.
Partition#1
H
SB#0
SB#1
IOU#0 IOU#1
: Home SB
H
: Reserved SB
R
PRIMEQUEST 2000 Series Design Guide
[Example] An SB is Set as a Reserved SB for Two Partitions.
(If SB#0 and SB#2 Fail Simultaneously)
Partition#0
H R R
SB#2 SB#3
IOU#2 IOU#3
Partition#1
H
SB#0
IOU#0
Not switched to
the Reserved SB
* The setting of SB#3 as the Reserved SB for partition#1 is
automatically cancelled when Reserved SB switching occurs.
75
Partition#0
H
SB#1 SB#2
IOU#1 IOU#2
The SB with the lowest SB
number is changed to the
new Home SB.
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SB#3
IOU#3