How Thin Image pairs are created
You can create a Thin Image pair with or without an S-VOL specified.
Without an S-VOL specified:
If hosts do not access snapshot data on a regular basis after storing it, you can create a Thin Image pair without specifying an S-VOL.
With an S-VOL specified:
If hosts do access snapshot data on a regular basis after storing it, you must specify an S-VOL when you create a Thin Image pair.
Thin Image pairs use V-VOLs as secondary volumes. V-VOLs must be defined before Thin Image pairs are created. Up to 1,024 secondary volumes can be specified for one primary volume.
When creating a Thin Image pair, you need to specify the pool to be used for the pair. If multiple Thin Image pairs share the same primary volume, the pairs must also share the same pool. For example, if you specify three secondary volumes for one primary volume, you must specify the same pool for the three Thin Image pairs.
If you release a Thin Image pair, the volume status becomes SMPL. Immediately after a volume becomes SMPL, you cannot use the volume to create a Thin Image pair. If you want to create Thin Image pairs using SMPL volumes, you should wait for a while before creating the pairs. The wait time required depends on your system environment.
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