Notes On System Mirror Operation - Fujitsu PRIMEQUEST 480 System Design Manual

CHAPTER 8 Partition
SB SB
#0 #1
Crossbar
IOU IOU IOU
#0 #1
Partition#0
8.3.3

Notes on System Mirror operation

PRIMEQUEST series machines are equipped with a System Mirror function which
duplicates the memory, crossbar, and chipset contents and has them perform the same
operation.
Even if either component becomes faulty, job processing need not be stopped and can
be continued. Operation in System Mirror provides higher reliability. For details of
System Mirror, see Section
8-6
SB #3 becomes
faulty.
Reserved SB
SB SB SB
#2 #3 #4
Rebooting partition #1
IOU IOU
#2 #3 #4
Partition#1
Figure 8.4 Flexible I/O component
6.3, "System Mirror."
Switching to the
reserved SB
SB SB SB SB SB
#0 #1 #2 #3 #4
Crossbar
IOU IOU IOU IOU IOU
#0 #1 #2 #3 #4
Partition#0 Partition#1
(1) Disconnecting SB #3
(2) Connecting IO_Unit #2 to the spare SB
C122-B001-02EN