HP XP RAID Manager Software - Manual (Page 145)

Figure 58 Snapshot and volume mapping
Snapshot volumes
The specifications for Snapshot volumes are:
•
Allowable type of paired volume: The supported volume type is OPEN-V only for P VOL, and
OPEN-0V for S VOL.
•
Number of volumes (Snapshot) can be paired: This depends on P VOL capacity, Snapshot
pool capacity, and shared memory capacity on the RAID storage system.
•
Duplicated writing mode: Copying on write.
•
Number of mirror volumes: Up to 64 secondary volumes can be defined for each P VOL.
•
Fast Snap: Up to 1,024 secondary volumes can be defined for each P VOL.
•
Snapshot: Up to 64 secondary volumes can be defined for each P VOL.
For details on Fast Snap or Snapshot specifications such as maximum number of mirrored volumes,
volumes and operations, please see the HP P9000 Fast Snap User Guide or HP P9000 Snapshot
User Guide for your storage system.
Creating a Fast Snap or Snapshot pair
The RAID Manager command for creating a Fast Snap or Snapshot pair is the same as for Business
Copy. However, Fast Snap pair can only operate up to 64 S-VOLs. Therefore, use raidcom command
if you want to operate more than 64 S-VOLs.
The RAID storage system determines whether it is a Business Copy pair or a Fast Snap/Snapshot
pair by the attribute of the S-VOL. The RAID storage system also determines whether it is a Fast
Snap pair or a Fast Snap or Snapshot pair by the type of the pool to be used.
A Fast Snap pair is generated in the following two cases:
•
When a V-VOL (OPEN-0V) is specified as an S-VOL.
•
When a pool for Fast Snap is specified as the pool type.
A Snapshot pair is generated in the following two cases:
•
When a V-VOL (OPEN-0V) is specified as an S-VOL.
•
When a pool for Snapshot is specified as the pool type.
Snapshot operations 145