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

Memory: Granularity Concepts
Granularity refers to the unit size by which memory assigned to all virtual partitions in a vPars
database (vpdb) can be increased or decreased. Granularity reflects only the unit size of memory
and not the amount of memory that is assigned.
This section briefly covers configuring memory granularity.
The default granularity is 128 MB for ILM and 128 MB for CLM. However, you can specify your
own granularity for CLM and/or ILM. Granularity has some specific restrictions and cannot be
changed in a vPars database after they are set. Be sure to read the CAUTION portion in the next
section.
Granularity Value Locations
Integrity Systems. There are two areas where granularity values are set:
1. The nPartition firmware, specifically the EFI variables in NVRAM (non-volatile RAM).
2. The vPars database.
In order for the virtual partitions in the vPars database to be able to boot, the granularity values
in the vPars database must match the granularity values in the firmware.
On Integrity systems, memory is divided into the granules by the firmware; therefore, it is
required that you set and match the corresponding EFI variables.
PA-RISC systems. There is only one area where granularity values are set: the vPars database.
For PA-RISC, there are no granularity values in the PA-RISC firmware. The memory is divided
into the granules by the vPars Monitor itself. Note that this means the update firmware option
([:y]) of vparcreate is ignored on PA-RISC.
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