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

NOTE:
The Default is :base. When neither :base or :float is specified, the default is :base.
When you add memory as :float, you must specify :float on the command line. Further, when
you wish to delete float memory, you must also specify :float on the command line, for example:
# vparmodify -p keira3 -d mem::256:float
If you do not specify :float when adding or deleting memory, regardless of the state of the
partition, the default of :base is attempted.
NOTE:
Mixed vPars Environments In a mixed HP-UX 11i v2/v3 vPars environment, or a mixed HP-UX
11i v1/v2/v3 vPars environment, dynamic memory migration is only supported on the vPars
versions that support dynamic memory migration. In other words, the both source and target
virtual partitions must be running vPars A.05.xx.
It is possible to perform add/delete memory operations on virtual partitions running A.04.xx, as
long as the target virtual partition is in the down state. Note that the vparmodify command
must be executed on a virtual partition running vPars A.05.xx.
For more information on mixed HP-UX 11i v2/v3 vPars environments or mixed HP-UX 11i
v1/v2/v3 vPars environments, see “Mixed HP-UX 11i v2/v3 vPars Environments in vPars A.05.xx”
(page 60) or “Mixed HP-UX 11i v1/v2/v3 vPars Environments in vPars A.05.03” (page 63).
Performance Note for Base versus Float Memory Amounts
When a virtual partition contains more base memory, this allows the OS to improve the memory
performance of applications since there is more locked memory at its disposal. When a virtual
partition contains more float memory in each virtual partition, this allows the user the flexibility
to move memory between partitions based on the memory needs in each partition, but this will
not be locked memory.
Note that similar to memory being reserved for the kernel in a non-vPars OS instance, the OS
kernel in a virtual partition requires some amount of base memory to boot and run. See
Appendix F (page 323), for a virtual partition’s base memory requirement.
For information on general memory management, including locked memory, see the white paper
HP-UX Memory Management available at http://docs.hp.com.
188 CPU, Memory, and I/O Resources (A.05.xx)