3PAR InForm® OS 2.2.4 Concepts Guide (320-200085 Rev B, March 2009)

10.6
Precautions and Planning
3PAR InForm OS Concepts Guide InForm OS Version 2.2.4
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 including but not limited to the following:
■ Total available space on your system.
■ Nature of the data running on the system.
■ Number of CPGs in the system.
■ Number of volumes associated with those CPGs.
■ Anticipated growth rate of volumes associated with CPGs.
10.2.4 Growth Limit
If the volumes that draw from a CPG are allowed to reach the CPG’s growth limit, the system
prevents them from allocating additional space. This safety mechanism stops a "runaway"
application or volume from exhausting all free space available to the CPG and causing invalid
(stale) snapshot volumes and/or new application write failures for volumes associated with
that CPG. However, the storage system does not prevent you from setting growth limits that
exceed the total capacity of the system. For example, on a 4 TB system it is possible to create a
CPG with a 5 TB growth limit. Likewise, it is possible to create five CPGs, each with a 2 TB
growth limit, etc.
NOTE: Refer to the InForm OS Messages and Operator’s Guide for additional
information about specific alerts. Responding to is described in the InForm OS CLI
Administrator’s Manual and the InForm OS Management Console On-line Help.
CAUTION: Do not allow volumes that draw from a CPG to exceed the CPG's
growth limit. Doing so can invalidate snapshot volumes.