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CHAPTER 3 Component Configuration and Replacement (Add, Remove)
3.2 High availability configuration
36
C122-E175-01EN
3.2.2 Reserved SB
In the Reserved SB function, a spare SB is mounted in the chassis in advance, the faulty SB is automatically
disconnected, the spare SB is incorporated and the partition is restarted. The spare SB intended for switching
when there is a fault is called the Reserved SB. All models in the PRIMEQUEST2000 series support the
Reserved SB function.
Using a Reserved SB function has the following advantages when a hardware error occurs in the SB.
- Quick recovery is possible without reduction in SB resources.
- In a partition with one SB, recovery is possible even if the SB fails (SB degradation)
In addition, in the 2000 series PRIMEQUEST Series, SB in a running partition can be also specified as a
Reserved SB. A Reserved SB can be used very effectively by using this function.
An SB in a running partition can be also used as a Reserved SB. In this case, the SB will be referred to as
Active Reserved SB.
The example below shows the operation wherein the SB of a partition in the test system being used as a
Reserved SB.
If there is an SB failure in a partition of the production system, the firmware issues a shutdown instruction to
the partition of the test system. After the shutdown is completed, the partition is incorporated as the SB of the
production system. However, this setting is applicable only if the shutdown time of the test system can be
permitted.
FIGURE 3.19 Example of operation of a partition of a test system using the SB as a Reserved SB
No.
Description
(1)
Production system
(2)
Test system
(3)
Partition #1 is shutdown
Remarks
- Reserved SB is used in case of hardware failure. The cause of switching to the Reserved SB from the
memory dump report cannot be determined. See the system event log of the MMB to find out the cause
of switching to the Reserved SB. The memory dump information is used for determining software failures.
- In a Windows installed partition, restart is prompted at the first startup, after switching to the Reserved
SB. Restart is done following instructions.
- In a Windows installed partition, when the operation is stopped during an SB failure, the time taken for
restarting has to be considered. The total time taken for two restarts, the reboot time and the time it
takes for the first startup after switching to the Reserved SB will be required. Besides, restart can be
carried out once, at the first startup when there is a failure, by implementing workaround in advance. For
details on the workaround, see '● Procedure to prevent Windows restart' of ‘3.4.3 Reserved SB Setting'
in "PRIMEQUEST 2000 series Installation Manual" (C122-E174)
Reserved SB definition
The definition of the Reserved SB is automatically canceled after the Reserved SB operates.
Note
When restoring during maintenance after the Reserved SB operation, replace the faulty unit and reset the
Reserved SB information from the Web-UI.
Reserved SB Setting Rules
The Reserved SB setting criteria are as follows.
- Any SB not belonging to the own partition can be set as a Reserved SB