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C122-B001-02EN
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.
shows an example for using a flexible I/O component in an intra-cabinet
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.
Figure 9.11 Example of using flexible operation in an intra-cabinet cluster
configuration
Switching to standby cluster
Switching to the reserved SB (SB #4)
The reserved SB is automatically changed
to the standby system by reboot.
The SB #3 is replaced and changed
to a reserved SB.
Crossbar
Crossbar
Crossbar
Crossbar
SB
#0
SB SB
SB
SB
#1 #2
#3
#4
IOU IOU
IOU IOU
#0
#1
#2
#3
SB
#5
SB
#5
SB
#0
SB SB
SB
SB
#1 #2
#3
#4
IOU IOU
IOU IOU
#0
#1
#2
#3
SB
#5
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#0
SB SB
SB
SB
#1 #2
#3
#4
IOU IOU IOU IOU
#0
#1
#2
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SB
#5
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SB SB
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#1 #2
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IOU IOU IOU IOU
#0
#1
#2
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Partition#0
Partition#1
Reserved SB
Standby
Active
Reserved SB
Partition#0
Partition#1
SB #3
becomes
faulty.
SB #3
becomes
faulty.
Reserved SB
Active
Standby
Partition#0
Partition#1
Reserved SB
Active
Standby
Partition#0
Partition#1
Standby Active Active Standby
SB #3
becomes
faulty.
SB #3
becomes
faulty.
SB #3
becomes
faulty.
SB #3
becomes
faulty.
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