Administrator Guide

Resetting a snapshot
As an alternative to taking a new snapshot of a volume, you can replace the data in a standard snapshot with the current data in the
source volume. The snapshot name and mappings are not changed.
This feature is supported for all snapshots in a tree hierarchy. However, a virtual snapshot can only be reset to the parent volume or
snapshot from which it was created.
CAUTION: To avoid data corruption, unmount a snapshot from hosts before resetting the snapshot.
You can reset a snapshot immediately. You also have the option of scheduling a reset-snapshot task.
To see more information about a snapshot, hover the cursor over the item in the volumes table. You can view different snapshot
information by hovering the cursor over the snapshot in the Snapshots table. See Viewing volumes for more details about the Volume
Information and Snapshot Information panels that appear.
Reset a snapshot
Perform the following steps to reset a snapshot:
1. Unmount the snapshot from hosts.
2. In the Volumes topic, select a snapshot.
3. Select Action > Reset Snapshot.
The Reset Snapshot panel opens.
4. Optional: To schedule a reset task, perform the following steps:
• Select the Schedule check box.
• Specify a date and time at least five minutes in the future to run the task. The date must use the format yyyy-mm-dd. The time
must use the format hh:mm and include either AM, PM, or 24H (24-hour clock). For example, 13:00 24H is the same as 1:00 PM.
• Optional: If you want the task to run more than once:
○ Select the Repeat check box and specify how often the task should run.
○ Optional: Specify when the task should stop running.
○ Optional: Specify a time range within which the task should run.
○ Optional: Specify days when the task should run. Ensure that this constraint includes the start date.
5. Click OK.
• If the Schedule check box was not selected, a Confirm Operation dialog box is displayed.
Click OK to reset the snapshot.
NOTE: You can remount the snapshot after it is reset.
• If the Schedule check box was selected, the reset snapshot schedule is created and a Success dialog box is displayed.
Click OK to close the Success dialog box. The schedule can be viewed in the Manage Schedules panel, as described in Managing
scheduled tasks.
NOTE: Remember to unmount the snapshot before the scheduled task runs.
Creating a replication set from the Volumes topic
You can create a replication set, which specifies the components of a replication. The Create Replication Set panel enables you to create
replication sets. You can access this panel from both the Replications and Volumes topics.
Performing this action creates the replication set and the infrastructure for the replication set. For a selected volume, snapshot, or volume
group, the action creates a secondary volume or volume group and the internal snapshots required to support replications. By default, the
secondary volume or volume group and infrastructure are created in the pool corresponding to the one for the primary volume or volume
group (A or B). Optionally, you can select the other pool.
A peer connection must be defined to create and use a replication set. A replication set can specify only one peer connection and pool.
When creating a replication set, communication between the peer connection systems must be operational during the entire process.
If a volume group is part of a replication set, volumes cannot be added to or deleted from the volume group.
Working in the Volumes topic
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