HP XP7 Storage - Manual (Page 7)

1 Overview of Fast Snap
With Fast Snap (FS), you can perform cost-effective replication by storing the differential data
between primary volumes (P-VOLs) and secondary volumes (S-VOLs) of virtual volumes (V-VOLs).
This chapter provides instructions for planning and designing, configuring, operating, monitoring,
and troubleshooting FS.
This chapter includes the following information:
Workflow for Fast Snap
Fast Snap stores snapshots, or a point-in-time copy of data, in a XP7 Storage (XP7) system. Creating
an FS pair changes the status to “PAIR” and stores snapshot data. You can use FS 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)
then updates the data. Snapshot data is a copy of differential data in FS P-VOLs. If your storage
system experiences a data storage failure, you can restore the data using the snapshot data in the
pool.
Splitting an FS pair saves a snapshot and stops the copying of replaced data in the pool.
The following figure shows an overview of the workflow of FS.
You can use snapshot data in open-system volumes.
Related topics
•
“Splitting Fast Snap pairs to store snapshot data” (page 73)
•
“Virtual volumes and Fast Snap pairs” (page 12)
•
“Components of Fast Snap pairs” (page 9)
•
“Workflow of the storing of snapshot data” (page 7)
Workflow of the storing of snapshot data
Snapshot data is data in the pool, which is replaced data.
Workflow for Fast Snap 7