Administrator Guide

You are initially creating an overall repository with one individual repository virtual disk. However, the overall repository can contain multiple
repository virtual disks in the future for expansion purposes.
Use the Consistency Group Snapshot Virtual Disk Repository Settings - Manual option to manually define the capacity
requirements for a consistency group snapshot virtual disk repository. The Manual method is considered advanced and only those who
understand physical disk consistency, provisioning, and optimal physical disk configurations should use this method.
The following guidelines apply:
• There is a minimum required capacity for a snapshot virtual disk repository (depending on your configuration).
• When you define the capacity requirements for a repository, keep in mind any future requirements that you may have for other virtual
disks in this disk group or disk pool. Make sure that you have enough capacity to meet your data storage needs, but you do not over
allocate because you can quickly use up all the storage in your storage array.
• The list of repository candidates can contain both new and existing repository virtual disks. Existing repository virtual disks are left on
the storage array by default when you delete a consistency group snapshot virtual disk. Existing repository virtual disks are placed at
the top of the list. The benefit to reusing an existing repository virtual disk is that you can avoid the initialization process that occurs
when you create a new one.
To create a consistency group snapshot virtual disk repository:
1. From the AMW, select the Storage & Copy Services tab.
2. Select the consistency group to which you want to add member virtual disks and then select Copy Services > Consistency Group >
Remove Member Virtual Disks.
The Consistency Group Snapshot Virtual Disk Settings window is displayed.
3. Select Manual and click Next to customize the repository candidate settings for the consistency group.
The Consistency Group Snapshot Virtual Disk Repository Settings - Manual window is displayed.
4. Select how you want filter the repository candidates for each member virtual disk in the consistency group, based on either a
percentage of the base virtual disk capacity or by preferred capacity.
The best repository candidate for each member virtual disk based on your selections is displayed.
5. Select Edit individual repository candidates if you want to edit repository candidates for the member virtual disks.
6. Select the repository, from the Repository candidates table, that you want to use for each member virtual disk in the consistency
group.
Select a repository candidate that is closest to the capacity you specified.
• The Repository candidates table shows both new and existing repositories that are capable of being used for each member
virtual disk in the consistency group based on the value you specified for percentage or the value you specified for preferred
capacity.
• By default, the system displays the repositories for each member virtual disk of the consistency group using a value of 20 percent
of the member virtual disk’s capacity. It filters out undersized repository candidates, and those with different Data Service (DS)
attributes. If appropriate candidates are not returned using these settings, you can click Run Auto-Choose to provide automatic
candidate recommendations.
• The Difference column shows the mathematical difference between your selected capacity and the actual capacity of the
repository candidate. If the repository candidate is new, the system uses the exact capacity size that you specified and displays
zero (0) in the Difference column.
7. To edit an individual repository candidate:
a. Select the candidate from the Repository candidates table and click Edit to modify the capacity settings for the repository.
b. Click OK.
8. In the % full box, define the value that determines when a warning is triggered when the capacity of a consistency group snapshot
virtual disk repository reaches the defined percentage.
9. Click Finish to create the repository.
Disabling Snapshot Virtual Disk or consistency group
Snapshot Virtual Disk
Use the Disable option when you want to invalidate a snapshot copy or a consistency group snapshot virtual disk. If the snapshot virtual
disk or consistency group snapshot virtual disk is designated as read-write, this option also allows you to stop any further write activity to
its associated snapshot repository virtual disk.
Use the Disable option if one of these conditions applies:
• You are finished with the snapshot virtual disk or consistency group snapshot virtual disk for the time being.
• You intend to re-create the snapshot virtual disk or consistency group snapshot virtual disk (that is designated as read-write) later and
want to retain the associated snapshot repository virtual disk so that it does not need to be created again.
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Premium feature—Snapshot Virtual Disk