HP XP7 Storage - Manual (Page 8)

The following figure shows how data in the pool is replaced.
NOTE: The host references the P-VOL, which includes Snapshot data A and Snapshot data B.
These snapshots are handled as FS S-VOLs.
Use the following workflow to replace data in the pool:
1. You create an FS pair. The pair is in “PAIR” status.
2. The host updates the P-VOL. The replaced data is copied to the pool (Snapshot data A).
3. The host updates the P-VOL again.
4. You split the FS pair. The copying of replaced data to the pool is stopped. The differential
data is stored as snapshot data (Snapshot data B). In the event of data corruption, you can
recover using this point-in-time data.
Components of Fast Snap
Fast Snap typically consists of the following components:
•
FS pairs (see “Components of Fast Snap pairs” (page 9) ).
•
Groups:
Consistency groups ◦
◦ Snapshot groups
8 Overview of Fast Snap