Dell POWERVAULT MD3600I - Manual (Page 132)

5. Select how you want to create the repositories for each member in the consistency group.
– Select Automatic and click Finish to create the repositories with the default capacity settings. This option is
the recommended one.
– Select Manual and click Next to define the capacity settings for the repositories; and then click Finish to
continue with the consistency group creation process. You can click Edit individual repository candidates
to manually edit a repository candidate for each member virtual disk.
NOTE: Use this option if you want to specify all of the customizable settings for the repositories. The
Manual method is considered advanced and only those who understand physical disk consistency
and optimal physical disk configurations should use this method. See the online help topics for more
information on setting the repository parameters.
6. Click Finish.
In the navigation tree, the consistency group and its properties are displayed under the Consistency Groups node.
Creating A Consistency Group Repository (Manually)
During the creation of a consistency group, a consistency group repository is created to store the data for all the
snapshot images contained in the group. A consistency group's repository is created initially with one individual
repository virtual disk.Each virtual disk that belongs to a consistency group is referred to as a member virtual disk. When
you add a virtual disk to a consistency group, the system automatically creates a new snapshot group that corresponds
to this member virtual disk. A consistency group repository must be created for every member virtual disk in the
consistency group to save the data for all the snapshot images contained in the group.
The Manual method is considered advanced and only those who understand physical disk consistency, provisioning,
and optimal physical disk configurations should use this method.
Keep these guidelines in mind when you name a consistency group:
• There is a minimum required capacity for a consistency group repository (depending on your configuration).
• When you define the capacity requirements for a repository, keep in mind any future requirements that you
might 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. 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 repository:
1. From the AMW, select the Storage & Copy Services tab.
2. Select Copy Services→ Consistency Group→ Create.
The Consistency Group Settings window is displayed.
3. Select Manual and click Next to customize the repository candidate settings for the consistency group.
The Consistency Group Repository Settings - Manual window is displayed.
4. Select how you want to 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.
For more information on the filter options, see the online help topics.
The best repository candidate for each member virtual disk based on the selections you made 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.
NOTE: Select a repository candidate that is closest to the capacity you specified.
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