Configuration - Fujitsu PRIMEQUEST 480 System Design Manual

CHAPTER 9 Clustering
Cluster operation by using a flexible I/O component and reserved SB
Using a flexible I/O component and reserved SBs in a cluster configuration can
shorten the time required for restoration to normal cluster operation even if a failure
occurs in an SB.
Figure 9.11
cluster configuration. A cluster switch occurs due to a failure in SB #3 of partition #1
(the active node) and partition #1 becomes the standby node. Partition #1 is stopped;
it can be placed in a state in which partition #1 can operate as the standby node by
disconnection of SB #3 and incorporation of SB #4 after a restart.
IOU IOU
Partition#0
Partition#0
Figure 9.11 Example of using flexible operation in an intra-cabinet cluster
9-14
shows an example for using a flexible I/O component in an intra-cabinet
Standby Active Reserved SB
SB SB SB SB SB
#0 #1 #2 #3 #4
SB #3 SB #3
becomes becomes
faulty. faulty.
Crossbar
IOU IOU
#0 #1 #2 #3
Partition#1
The SB #3 is replaced and changed
to a reserved SB.
Active Standby Reserved SB
SB SB SB SB SB
#0 #1 #2 #3 #4
Crossbar
IOU IOU IOU IOU
#0 #1 #2 #3
Partition#1
Switching to standby cluster
Standby
SB SB
#5 #0
IOU IOU
#0
Partition#0
Active
SB SB
#5 #0
IOU IOU IOU IOU
#0
Partition#0

configuration

Reserved SB
Active Active Standby
SB SB SB SB SB
#1 #2 #3 #4 #5
SB #3 SB #3
becomes becomes
faulty. faulty.
Crossbar
IOU IOU
#1 #2 #3
Partition#1
Switching to the reserved SB (SB #4)
The reserved SB is automatically changed
to the standby system by reboot.
Standby Reserved SB
SB SB SB SB SB
#1 #2 #3 #4 #5
SB #3 SB #3
becomes becomes
faulty. faulty.
Crossbar
#1 #2 #3
Partition#1
C122-B001-02EN