HP StoreVirtual 4000 Storage - Manual (Page 7)

Planning the remote snapshot
Prerequisites for creating a remote snapshot
•
Log in to both the management group that contains the primary volume and the management
group that contains the target cluster where the remote snapshot will be created.
•
Designate or create a remote volume in that remote management group.
•
Ensure there is enough space on the target cluster for the remote snapshot.
Logging in to primary and remote management groups
Log in to both the primary and the remote management groups before you begin, or you must log
in to the remote management group while creating a remote copy.
Designating or creating the remote volume
Create a remote volume by using any of the following methods:
•
Make an existing volume into a remote volume.
•
Create a new remote volume while creating a remote snapshot.
•
Create a new volume from the cluster Details tab window, and then select the Remote radio
button on the Advanced tab of the New Volume window.
From the menu bar, select Tasks
→Volume→New Volume.
For more information about these methods of creating remote volumes, see “Creating a remote
volume” (page 14) .
Using schedules for Remote Copy
Scheduled remote snapshots provide fault tolerance for business continuance and disaster recovery,
and a consistent, predictable update of data for remote backup and recovery.
Planning the Remote Copy schedule
Planning is critical. The following issues impact the amount of storage available in the system:
•
Recurrence
•
Capacity
•
Retention
Recurrence
How often do you want the snapshots created? The recurrence frequency must account for the
amount of time it takes to complete a remote snapshot. For example, if your recurrence schedule
is set for a new snapshot every four hours, you should ensure that the time to copy that snapshot
to the remote location is less than four hours.
Testing the copy time
One way to check the time required to copy a snapshot is to run a test of the actual process. To
test this process, take two remote snapshots of the primary volume. Because the first remote snapshot
copies the entire volume, it takes longer to copy. The second remote snapshot copies only changes
made to the volume since the first remote snapshot was taken. You create the second remote
snapshot after the time interval you intend to schedule. Because of that, the copy time for the second
remote snapshot is more representative of the actual time required for copying subsequent remote
snapshots.
To test the copy time:
Using schedules for Remote Copy 7