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

10.4
Precautions and Planning
3PAR InForm OS Concepts Guide InForm OS Version 2.2.4
10.2.2 Growth Increment
As volumes that draw from a CPG require additional storage, the system automatically creates
additional logical disks according to the CPG's growth increment. The default growth
increment 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 a four-node system (Table 10-1).
In order to take full advantage of CPG functionality, it may be desirable in some cases to use a
larger growth increment. However, a smaller growth increment carries less risk in that it can
prevent the CPG from automatically allocating a large amount of space at an inopportune
time.
The growth increment you choose will depend 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 the volumes associated with the CPG.
Table 10-1. Default and Minimum Growth Increments
Number of nodes Default Minimum
2 32 GB 8 GB
4 32 GB 16 GB
6 32 GB 24 GB
8 32 GB 32 GB