Thin Image Advanced stores snapshots in a Hitachi Virtual Storage Platform family (VSP family) storage system. If a logical data failure occurs in the storage system due to erroneous data update or virus infection, you can restore it using the stored snapshot of the data. Pairs created by using Thin Image Advanced are called Thin Image Advanced pairs in this document.
To store snapshot data, you create a Thin Image Advanced pair by using data reduction shared volumes for which the capacity saving function is enabled. A pair created to store snapshot data is referred to as a snapshot pair. A snapshot pair displays showing the snapshot attribute.
When you create a Thin Image Advanced pair, the status changes to "PAIR" and snapshot data is stored. You can use Thin Image Advanced to store a maximum of 1,024 snapshots of data.
Updating the P-VOL first copies the differential data as snapshot data in pool volumes (pool-VOL), and then updates the data. Snapshot data is a copy of differential data in Thin Image Advanced P-VOLs. If your storage system experiences a data storage failure, you can restore the data using the snapshot data in the pool.
Splitting a Thin Image Advanced pair saves a snapshot and stops the copying of replaced data in the pool.