User's Manual

and the virtual partition allows enough additional cores to fulfill the request . Otherwise, use
the parmodify command to reconfigure the nPartitions, or use the vparmodify command to
remove cores from other virtual partitions within the same nPartition (essentially adding to the
unassigned pool).
Example Core Activation Session
Example 4-3 shows how to activate an additional core in an nPartition environment. At the
beginning of this activation session, there are a total of 4 cores in the partition; 2 cores are activated
and 2 are inactive, but usage rights have been acquired to activate at least one inactive core. In
this example, 1 additional core is activated, leaving the partition with 3 active cores and 1 inactive
core.
Example 4-3 Activating an Additional Core (HP-UX)
> /usr/sbin/icapmodify -a 1 "Add CPU for new FY: Bill P."
3 cores are intended to be active and are currently active.
In this example, note the following:
• The core activation is instant (that is, a reboot is not required).
• The double-quoted text serves as an audit trail of why the activation was done and who
performed it. This information is optional and is written to the Instant Capacity log file
(var/adm/icap.log) if provided.
NOTE: To defer the activation until the next reboot, add the -D option to the command. For
more information, see icapmodify(1M).
The icapmodify command allows you to activate additional cores with the -a option, or set
the total number of active cores with the -s option. For example, the icapmodify -a 2
command activates two additional cores in a partition. The icapmodify -s 2 command sets
the total number of active cores in a partition to 2.
For details about software application implications when activating additional cores, see “Software
Application Considerations” (page 71).
58 Using Instant Capacity to Manage Processing Capacity