You can calculate the required pool capacity by estimating the capacity of snapshot data to be copied.
Use the following formula:
Capacity of snapshot data to be copied = Capacity of data written to the same area in the P-VOL during the period from when snapshot data is stored to when the snapshot data is deleted
Although the pool capacity is decided according to the estimation, if the pool capacity exceeds the threshold, address the issue.
If multiple snapshot data are stored, the data may be shared in a pool. In this case, you can release Thin Image pairs, but the snapshot data cannot be deleted from the pool. If you release all Thin Image pairs that have snapshot data containing the shared data, the snapshot data are also deleted from the pool.