2.2.2.3Omit-memory Option

When the omit-memory option is enabled, the memory on a system board cannot be used in the domain.

Even when a system board actually has memory, this option enables you to make the memory on the system board unavailable through a DR operation to add or move the system board.

This option can be used when the target domain needs only the CPU (and not the memory) of the system board to be added.

If a domain has a high load on memory, an attempt to delete a system board from the domain may fail. This failure results if a timeout occurs in memory deletion processing (saving of the memory of the system board to be disconnected onto a disk by paging) when many memory pages are locked because of high load. To prevent this situation, you can enable the omit-memory option to facilitate the DR operation beforehand.

Note – For diagnosis and management of a system board, memory must be mounted on the system board even if the omit-memory option is enabled. Enabling the omit-memory option reduces available memory in the domain and may lower system performance. This option must be used in consideration of the influence on jobs.

The value of this option is “true” (omit memory) or “false” (do not omit memory). The default value is “false”.

Note – Enable the omit-memory option when the system board is in the system board pool or when the system board is not connected to the domain configuration.

2.2.2.4Omit-I/O Option

The omit-I/O option disables the PCI cards, disk drives, and basic local-area network (LAN) ports on a system board to prevent the target domain from using them.

Set this option to “true” if the domain needs to use only the system board’s CPU and memory.

Set this option to “false” if the domain needs to use the system board’s PCI cards and I/O units. In this case you must fully understand the restrictions on use of these I/O components. And you must stop the software (e.g. application programs or daemons) that uses them before you attempt to delete or move the system board.

The value of this option is “true” (omit I/O units) or “false” (do not omit I/O units). The default value is “false”.

Chapter 2 What You Must Know Before Using DR 2-15