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CHAPTER 3 Component Configuration and Replacement (Add, Remove)
3.2 High availability configuration
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C122-E175-01EN
- For the partition with DR mode enable, memory size within PPAR must be 1TB or less.
When hot adding SB, total memory size within the PPAR must be 1TB or less after adding a SB.
- Do not perform DR operation when high load is applied to the partition since TIMEOUT may occur if DR
operation is performed when high load is applied to the partition.
- In case you intend to perform hot add of SB or IOU, DR operation will not be possible if there is a warning
or error in the SB or IOU to be added.
- The TSC (Time Stamp Counter) of added SB by SB hot add does not synchronize with the running
system.
- The settings of the Reserved SB are deleted after the Reserved SB is incorporated into the partition by
hot add.
- In case of hot remove of the Reserved SB that belongs to a partition, the Reserved SB setting is not
canceled.
- DR operation (SB hot add, SB hot remove, IOU hot add, IOU hot remove, hot add of PCI Express card or
hot remove of PCI Express card) can't be performed in parallel at the same time in the chassis. .
- SB hot add or SB hot remove operation cannot be specified at the same time for multiple SBs.
- DR operation cannot be performed on the EFI Shell.
- The DR operation takes several minutes, and the execution cannot be canceled.
- When DR is enabled, a HDD/SSD on the non-Home SB cannot be used.
- In case of hot addition of SB with the memory mirror mechanism enabled, the DR operation may fail if the
SB to be added does not meet the mirror mode setting conditions of the target partition.
- The sadump function does not work during the SB hot plug operation.
- Do not perform DR operation to a component mounting dump device or a component which is connected
to dump device.
- If hot remove of SB is implemented when allocating a process to a specific CPU using CPU binding, the
relevant process will be moved to another CPU which is not intended.
- For IOU hot remove, the kdump or sadump will not function if an IOU having a kdump disk or a sadump
disk is removed.
- When executing the DR in a cluster configuration, the execution is performed after disconnecting the
relevant machine from the cluster group. For details, see ‘PRIMECLUSTER Installation and
Administration Guide’ (J2UZ-5274-08Z0).
- If power control such as power off, reset and power cycle or error occurs during SB hot add, partition
configuration differs depending on whether test phase process, which is check process of SB prior to SB
add process, is completed or not.
- If test phase process is not completed, partition configuration is the same one as before SB hot add.
The partition does not include an added SB.
- If test phase process is completed, partition configuration changes to the configuration specified by DR
operation. The partition includes not only current SBs but also an added SB.
- Hot add or hot remove of an IOU which is connected a DU cannot be performed.
- DR operation cannot be performed if memory operation mode is Performance mode.
- Error of IO and memory cannot be sometime detected during SB hot add and SB hot remove.
- Legacy OS cannot be started up since a partition with DR mode enabled forcibly starts up in UEFI mode.
If you start up Legacy OS, disable DR mode.
- For IOU hot add or IOU hot replacement, PCI bus address which is allocated to PCI device on relevant
IOU just after IOU hot add or replacement may differ at next partition boot.
- Error of added IO may not be detected during hot adding an IOU.
- Do not enable DR function and TXT/TPM function together.