Top Ten Tips for Using Virtual Partitions

vPar’s usage, there are only two modes:
• vPars - sets the next nPartition boot to boot into the vPars environment. This allows you to boot the
vPars Monitor and therefore the virtual partitions in the next nPartition boot. You still need to
boot the vPars Monitor and the virtual partitions, but this mode allows you to do this.
• nPars - sets the next nPartition boot to boot into the standalone environment. In this mode, you
cannot boot the vPars Monitor and therefore the virtual partitions. However, you can boot
any OE instance into standalone mode.
Prevention and Suggestions
You can set the mode from the following levels using the corresponding commands:
HP-UX Shell: vparenv [-m mode]
#vparenv –m vPars
Monitor: reboot [mode]
MON> reboot nPars
EFI: vparconfig [reboot mode]
fs0:\> vparconfig reboot vPars
Please see the document “Installing and Managing HP-UX Virtual Partitions” for more details.
#3 – Memory Granularity and Booting
Symptoms: Functionality
Granularity refers to the unit size in which memory is assigned to all virtual partitions in a given vPars
database (vpdb). Granularity reflects only the unit size of memory and not the amount of memory that
is assigned.
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.
Prevention and Suggestions
Granularity in the vPars database can only be specified during the creation of the vPars database.
This means the first vparcreate command performed to create the database can be used to specify the
granularity, but it cannot be changed after that. It cannot be changed by subsequent vparcreate
commands nor any other commands; any change in values requires the entire vPars database to be
re-created.
To change the granule sizes, it is necessary to:
1. record all virtual partition configurations
2. boot standalone
3. remove /stand/vpdb
4. re-create all virtual partitions, specifying the new granule sizes to the first vparcreate
command
Please see the document “Installing and Managing HP-UX Virtual Partitions” for more details.
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