HP-UX Virtual Partitions Administrator's Guide (includes A.05.02)

CPU, Memory, and I/O Resources (A.05.xx)
Memory: Granularity Concepts
Chapter 6
208
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. Please 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 Monitor itself. Note that this means the update firmware option ([:y]) of vparcreate is
ignored on PA-RISC.