3PAR InForm® OS 2.3.1 CLI Administrator's Manual (320-200180 Rev B, February 2010)

7.4
Common Provisioning Groups
3PAR InForm CLI Administrator’s Manual InForm OS Version 2.3.1
7.2 Common Provisioning Groups
By default, a CPG is configured to auto-grow new logical disks when the amount of available
logical disk space falls below a configured threshold. CPGs are initially empty. The initial buffer
pool of logical disks starts off at a fraction of the exported virtual capacity of mapped volumes
and automatically grows over time as required by application writes. For detailed information
about CPG growth warnings and growth limits, see the 3PAR InForm OS Concepts Guide.
7.2.1 Growth Increment Considerations for Common Provisioning Groups
The default growth increment of a CPG is fixed at 32 GB, but the minimum growth increment
varies according to the number of controller nodes in the system and ranges from 8 GB for a
two-node system to 32 GB for an eight-node system (Table 7-1).
There are several courses of action you can take such as adding physical disks to the system, or
limiting the future growth of volumes that draw from the CPG. Your response will vary
depending on several factors:
NOTE: Virtual volumes in the same CPG can share the same logical disk. In the
unlikely event that the logical disk is damaged by multiple simultaneous disk
failures, all the volumes associated with that logical disk will be unavailable.
NOTE: Virtual volume performance may suffer from too much interleaving within
the logical disks.
Table 7-1. Default and Minimum Growth Increments
Number of nodes Default Minimum
2 32 GB 8 GB
4 64 GB 16 GB
6 96 GB 24 GB
8 128 GB 32 GB