HP-UX Virtual Partitions Administrator Guide (includes A.05.07) (5900-1229, September 2010)

keira1# vparmodify -p keira2 -m cpu::2
If you would like to add 1 CPU to an existing partition, regardless of its current CPU count,
you can add 1 CPU by using the -a option and setting num to 1:
keira1# vparmodify -p keira2 -a cpu::1
To remove the added CPU from the partition, use the -d option and set num to 1:
keira1# vparmodify -p keira2 -d cpu::1
238 CPU, Memory, and I/O Resources (A.04.xx)