HP-UX Virtual Partitions Administrator Guide (includes A.05.08) (5900-1312, March 2011)

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 58)
or “Mixed HP-UX 11i v1/v2/v3 vPars Environments in vPars A.05.03” (page 62).
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 291), for a virtual partition’s base memory requirement.
For information on general memory management, including locked memory, go to the BSC website
at www.hp.com/go/hpux-core-docs, click HP-UX 11i v3 and see the white paper HP-UX 11i v3
Memory Management Subsystem .
Memory: Concepts and Functionality 179