Fujitsu primequest 2400E2 Design Manual page 75

3.2.3 Switching Reserved SB Rules (1/5)
Switching Conditions

An SB that is incorporated in a partition is switched to a Reserved SB when one of the following
events occurs (*1).
SB degradation (Memory Scale-up Boards are not supported by the Reserved SB

function.)
CPU core degradation

DIMM degradation (even if one DIMM fails)

Detection of partial corruption in the memory of the mirroring pair (*2)

Detection of QPI lane degradation (*2)

Detection of SMI2 lane switchover (*2)

Detection of PCI Express lane/speed degradation (between a CPU and an IOU) (*2)

(*1) Actual Reserved SB switching occurs when the partition is started after a condition for Reserved SB switching
is met.
(*2) Because the partition operation continues, Reserved SB switching occurs when the partition is rebooted
manually.
When the Home SB is Switched

When the Home SB is switched to a Reserved SB, the SB with the lowest SB number among SBs
including Reserved SBs is changed to the Home SB.
* The same rule applies even if a degradation occurs.
For details on switching conditions, refer to "3.2.4 Reserved SB" in "Administration Manual".
PRIMEQUEST 2000 Series Design Guide 74 Copyright 2016-2017 FUJITSU LIMITED