Figure 1.12 Reduced Mttr - Fujitsu PRIMEQUEST 480 System Design Manual

CHAPTER 1 PRIMEQUEST Overview
Reduced MTTR
Figure 1.12
Operation is switched to reserved SB #4 when a hardware failure occurs on SB #3.
SB #3 is disconnected from Partition #1. The active IO_Unit #2 can be connected to
the reserved SB #4 as is by the flexible I/O mechanism. This shortens the MTTR to
the time necessary for rebooting only, resulting in a great improvement in system
availability.
SB SB
#0 #1
Crossbar
IOU IOU IOU
#0 #1
Partition#0
1-18
shows an example where the MTTR is shortened by a reserved SB.
SB #3 becomes
faulty.
Reserved SB
SB SB SB
#2 #3 #4
Rebooting partition #1
IOU IOU
#2 #3 #4
Partition#1

Figure 1.12 Reduced MTTR

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