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

Changing the settings of a consistency group

Use the Change Consistency Group Settings option to modify the auto-delete settings and the consistency group repository settings that were configured when you created the consistency group.

  • Auto-Delete Settings — You can configure each consistency group to keep the total number of snapshot images in the group at or below a user-defined maximum. When this option is enabled, the system automatically deletes the oldest snapshot image in the group, any time a new snapshot is created, to comply with the maximum number of snapshot images allowed for the group.
  • Consistency Group Repository Settings — You can define a maximum percentage for the consistency group member repository that determines when a warning is triggered when the capacity of a consistency group member repository reaches the defined percentage. In addition, you can specify which policy to use when the capacity of the consistency group repository reaches its maximum defined percentage:
    • Automatically purge oldest consistency image— The system automatically purges the oldest consistency image in the consistency group, which releases the repository’s reserve space for reuse within the consistency group.
  • Reject writes to base virtual disk— When the repository reaches its maximum defined percentage, the system rejects any I/O write request to the base virtual disk that triggered the repository access.
  1. From the AMW, select the Storage & Copy Services tab.
  2. From the consistency groups category node, select the consistency group that you want to change and then select Copy Services > Consistency Group > Change Settings.
    The Change Consistency Group Settings window is displayed.
  3. Change the consistency group settings as required.
  4. Click OK to apply your changes to the consistency group.

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