How Thin Image uses pools and pool volumes

Thin Image User Guide

Version
9.8.6
Audience
anonymous
Part Number
MK-98RD9020-16

Thin Image stores snapshot data in DP pools (Pool Type: Dynamic Provisioning in HDvM - SN, or pools created by the raidcom add dp_pool command and displayed by the raidcom get pool -keyoption in CCI) or Thin Image pools (Pool Type: Thin Image in HDvM - SN, or pools created by the raidcom add snap_pool command and displayed by the raidcom get pool -key option in CCI). Unless they are defined otherwise, both DP pools and Thin Image pools are referred to as "pools". A pool consists of multiple pool volumes (pool-VOLs) which are, as a group, the container for the snapshot data.

You must create pools to use Thin Image. You can create pools and add and delete pool-VOLs from them using Thin Image.

The following figure illustrates the relationship between a Thin Image pair and a pool.



CAUTION:
When creating pools, calculate the pool capacity and reserve a sufficient amount of pool capacity. When you write data to Thin Image pair volumes and the amount of pool usage exceeds the pool capacity, the Thin Image pair is suspended (“PSUE” status), snapshot data is not stored, and you cannot create additional Thin Image pairs.