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Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

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Manually creating a consistency group repository

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.
    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.
    • 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% 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:
    1. Select the candidate from the Repository candidates table and click Edit to modify the capacity settings for the repository.
    2. Click OK.
  8. Select View advanced options and then accept or change the following default settings as appropriate.
  9. Click Finish.

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