Points To Consider When Determining Configurations - Fujitsu PRIMEQUEST 480 System Design Manual

8.3 Points to Consider when Determining
Configurations
This section describes the points to consider when determining the configuration and
operation of partitions. The partition configuration must be determined by
considering the requirements of each system.
8.3.1 SB and IO_Unit maintenance policy
The system administrator must determine whether to use the hot swapping function
of the SB or IO_Unit or to perform maintenance with partitions stopped.
Since components are swapped without stopping job processing when the hot
swapping function is used, a multi path or redundant configuration must be
adopted for the disks and networks.
8.3.2 Flexible I/O component and reserved SB
A flexible I/O component is mounted in PRIMEQUEST series machines. The
flexible I/O component provides a function which separates SBs and IO_Units and
allows the SBs and IO_Units to be combined freely. This component can connect
SBs and IO_Units freely in comparison with a method that allocates SBs and
IO_Units permanently.
Although a reserved SB does not belong to any partition, it can be incorporated in a
partition to replace a faulty SB. To replace a faulty SB with a reserved SB, the
reserved SB can be set as the reserved SB of the partition on the [Reserved SB
Configuration] screen of the MMB Web-UI.
If an SB in a partition becomes faulty, the system switches from the faulty SB to the
reserved SB. At the same time, the connections between the faulty SB and IO_Units
are switched to those of the reserved SB to continue job processing. The flexible I/O
component enables the system to restore only by reboot.
Mounting the flexible I/O component and reserved SBs can widely reduce the restore
time necessary if an SB becomes faulty.
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8.3 Points to Consider when Determining Configurations

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