Hewlett Packard Enterprise HPE XP7, Руководство пользователя, Страница: 8 / 311

Overview of Fast Snap
About Fast Snap
To store snapshot data, you create a pair with a logical volume functioning as the P-VOL, and a virtual
volume as the S-VOL. 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 Fast Snap pair, the status changes to "PAIR" and snapshot data is stored. You can
use Fast Snap to store a maximum of 1,024 snapshots of data (including the number of clones when you
clone a volume).
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 Fast Snap 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 Fast Snap pair saves a snapshot and stops the copying of replaced data in the pool.
The following figure provides a basic illustration of storing snapshot data.
You can use snapshot data in open-system volumes.
More information
How Fast Snap uses V-VOLs on page 22
Splitting Fast Snap pairs to store snapshot data on page 120
Workflow for storing Fast Snap snapshot data
1. Create a Fast Snap pair. You can create a pair with the snapshot attribute (snapshot pairs). The pair is
in "PAIR" status.
2. The host updates the primary volume.
3. Split the snapshot pairs. The snapshot data of the primary volume is stored (Snapshot data A in the
figure below).
8 Overview of Fast Snap