HP Instant Capacity User's Guide for versions B.07.x

Using Instant Capacity to Manage Processing Capacity
Deactivating Processors
Chapter 4 59
Deactivating Processors
Deactivating
Processors in
nPartitions
You have the ability to decrease processor capacity instantly on HP
enterprise servers with the Instant Capacity software. Any number of
active processors can be deactivated at any time, within the partition
constraints listed below. Processor deactivation can be useful for load
balancing processors in nPartitions (hard partitions) of Instant Capacity
systems. See “Instant Capacity Integration with Virtual Partitions” on
page 132 for details about deactivating processors in virtual partitions.
The software provides two types of processor deactivation:
• Instant (icod_modify command’s default behavior) — the
deactivation occurs immediately
• Deferred (icod_modify command’s -D option) — the deactivation
occurs after the next reboot of the partition
Instant deactivation of processors occurs when the icod_modify
command is used with the -d option, and the -D option is not specified.
Deferred deactivation of processors occurs when the icod_modify
command is used with both the -D and -d options specified. With the
deferred option (-D), processor deactivation occurs after a reboot of the
partition. The scheduled timing of the reboot (and the processor
deactivation) can take place at a planned time. For example, if you
deactivate processors in deferred activation mode and schedule a
partition reboot to occur on the first day of the next month, the
processors are deactivated at that time.
To deactivate one or more active processors, use the icod_modify
command as root. See the manpage icod_modify(1M) for details.
Partition
Constraints
An nPartition must have a minimum of one active processor for each
active cell. Deactivation of processors is limited by this rule. If the
deactivation applies to a virtual partition, additional constraints may
apply, such as the minimum number of processors specified for the
virtual partition.