Administrator Guide

You can enable this option for overall repository virtual disks that contain consistency information. RAID Level 1, RAID Level 5, and RAID
Level 6 maintain consistency information.
You can enable this option for overall repository virtual disks that contain consistency information. RAID Level 1, RAID Level 5, and RAID
Level 6 maintain consistency information.
You can change the Pre-Read Consistency Check for an overall repository for the following storage objects:
• Snapshot group
• Snapshot virtual disk
• Consistency group member virtual disk
• Replicated Pair
The following guidelines apply:
• Changing the Pre-Read Consistency Check setting modifies the setting only for the overall repository that you selected.
• The Pre-Read Consistency Check setting is applied to all individual repository virtual disks contained within the overall repository.
• If an overall repository virtual disk that is configured with pre-read is migrated to a RAID level that does not maintain consistency
information, the metadata of the overall repository virtual disk continues to show that pre-read is enabled. However, reads to that
overall repository virtual disk ignores consistency pre-read. If the virtual disk is subsequently migrated back to a RAID level that
supports consistency, the option becomes available again.
To create a consistency group snapshot virtual disk:
1. From the AMW, select the Storage & Copy Services tab.
2. Select the storage object for which to change the pre-read consistency check settings.
3. Right click the select object and select Overall Repository > Change Pre-read Consistency Check.
4. Select Enable pre-read consistency check, and click OK.
NOTE:
Enabling the option on overall repository virtual disks without consistency does not affect the virtual disk.
However, the attribute is retained for that overall repository virtual disk if it is ever changed to one with consistency
information.
5. Click Yes.
Deleting Snapshot Virtual Disk or consistency group Snapshot Virtual
Disk
Use the Delete Snapshot Virtual Disk option to delete a snapshot virtual disk or consistency group snapshot virtual disk that is no
longer needed for backup or software application testing purposes. You also can specify whether you want to delete the snapshot
repository virtual disk associated with a read-write snapshot virtual disk or a read-write consistency group snapshot virtual disk or retain
the snapshot repository virtual disk as an unmapped virtual disk.
When a snapshot virtual disk or consistency group snapshot virtual disk is deleted, the system performs the following actions:
• Deletes all member snapshot virtual disks—for a consistency group snapshot virtual disk.
• Removes all associated host mappings.
NOTE:
Deleting a base virtual disk automatically deletes any associated snapshot virtual disk or consistency group
snapshot virtual disk. You cannot delete a snapshot virtual disk that is in a virtual disk copy with a status of In Progress.
To rename a snapshot virtual disk or consistency group snapshot virtual disk:
1. From the AMW, select the Storage & Copy Services tab.
2. Select the snapshot virtual disk or consistency group snapshot virtual disk that you want to disable and then select one of the
following:
• Copy Services > Snapshot Virtual disk > Delete. The Confirm Delete Snapshot Virtual Disk window is displayed.
• Copy Services > Consistency Group Snapshot Virtual Disk > Delete. The Confirm Delete Consistency Group Snapshot
Virtual Disk window is displayed.
3. If the snapshot virtual disk or the consistency group snapshot virtual disk is read-write, select the option to delete the associated
repository.
4. Type yes in the text box and then click Delete to delete the snapshot virtual disk or consistency group snapshot virtual disk.
Premium feature—Snapshot Virtual Disk
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