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HP-UX Virtual Partitions Administrator’s Guide > Chapter 6 CPU, Memory, and I/O Resources (A.05.xx)

Memory: Granularity Concepts

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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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