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

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Adding a member virtual disk to a consistency group

Use the Add Member Virtual Disks option to add a new member virtual disk to an existing consistency group. When a new member is added to a consistency group, you must also add a repository virtual disk.

Standard virtual disks and thin virtual disks are the only type of virtual disks that can be used for a consistency group. The base virtual disk can reside on either a disk group or a disk pool.
If you decide to re-create the snapshot virtual disk or consistency group snapshot virtual disk, you must choose a snapshot image from the same base virtual disk.
The following guidelines apply:
  • The Snapshot premium feature must be enabled on the storage array.
  • To add a new member virtual disk, the consistency group must have has less than the maximum number of allowable virtual disks (as defined by your configuration).
  • If the base virtual disk resides on a standard disk group, the repository members for any associated consistency group can reside on either a standard disk group or a disk pool. If a base virtual disk resides on a disk pool, the repository members for any associated consistency group must reside on the same disk pool as the base virtual disk.
  • You cannot add a member virtual disk that is in a failed state.
  1. From the Array Management Window (AMW), select the Storage & Copy Services tab.
  2. Do one of the following:
    • Select the base virtual disk that you want to add to the consistency group and then select Storage > Virtual disk > Add to Consistency Group. The Select Consistency Group and Repository window is displayed.
    • Select the consistency group to which you want to add member virtual disks and then select Copy Services > Consistency Group > Add Member Virtual Disks. The Select Virtual Disks and Repositories window is displayed.
  3. Depending on your selection in step 2, do one of the following:
    • In the Select Consistency Group and Repository window, select the consistency group from the Consistency groups table, to which you want add the base virtual disk.
    • In the Select Virtual Disks and Repositories, select the member virtual disks from the eligible virtual disks table, that you want to add to the consistency group. The eligible virtual disks table shows only those virtual disks that are capable of being used in the consistency group. You can click the Select all check box to add all the virtual disks displayed in the Eligible virtual disks table to the consistency group.
  4. Select how you want to create the repository for the member virtual disk(s) you are adding to the consistency group:
    • Select Automatic and click Finish to create the repository with the default capacity settings. This option is the recommended one.
    • Select Manual and click Next to define the capacity settings for the repository and then click Finish.
    Use the Manual option if you want to specify all of the customizable settings for the repository. The Manual method is considered advanced and only those who understand physical disk consistency and optimal physical disk configurations should use this method.
    The new member virtual disk(s) for the consistency group are displayed in the Member Virtual Disks table.
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