HP StoreAll Storage - Manual (Page 369)

Planning for snapshots
This section describes how to configure the cluster to take snapshots.
Preparing the snapshot partition
The block snapshot feature does not require any custom settings for the partition. However, HP
recommends that you provide sufficient storage capacity to support the snapshot partition.
NOTE: If the snapshot store is too small, the snapshot will eventually exceed the available space
(unless you detect this and manually increase storage). If this situation occurs, the array software
deletes the snapshot resources and the StoreAll software snapshot feature invalidates the snapshot
file system.
Although you can monitor the snapshot and manually increase the snapshot store as needed, the
safest policy is to initially provision enough space to last for the expected lifetime of the snapshot.
The optimum size of the snapshot store depends on usage patterns in the origin file system and
the length of time you expect the snapshot to be active. Typically, a period of trial and error is
required to determine the optimum size.
See the array documentation for procedures regarding partitioning and allocating storage for file
system snapshots.
Registering for snapshots
After setting up the snapshot partition, you can register the partition with the Fusion Manager. You
will need to provide a name for the storage location and specify access parameters (IP address,
user name, and password).
The following command registers and names the array’s snapshot partition on the Fusion Manager.
The partition is then recognized as a repository for snapshots.
ibrix_vs -r -n STORAGENAME -t { msa | lefthand | 3PAR | eqlogic} -I IP(s) -U USERNAME
[-P PASSWORD]
Example of HP 3PAR snapshot registration:
ibrix_vs -r -n 3PAR_STORAGE -t 3PAR -I 10.2.11.25 -U 3par_username -P
3par_password
To remove the registration information from the configuration database, use the following command.
The partition will then no longer be recognized as a repository for snapshots.
ibrix_vs -d -n STORAGENAME
Discovering LUNs in the array
After the array is registered, use the -a option to map the physical storage elements in the array
to the logical representations used by StoreAll software. The software can then manage the
movement of data blocks to the appropriate snapshot locations on the array.
Use the following command to map the storage information for the specified array:
ibrix_vs -a [-n STORAGENAME]
Reviewing snapshot storage allocation
Use the following command to list all of the array storage that is registered for snapshot use:
ibrix_vs -l
To see detailed information for named snapshot partitions on either a specific array or all arrays,
use the following command:
ibrix_vs -i [-n STORAGENAME]
Planning for snapshots 369