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# Create device groups

A device group is a user-defined group that consists of devices that belong to a locally attached storage system. Control operations can be performed on the group as a whole, or on the individual device pairs in the group. By default, a device can belong to more than one device group.

## Prerequisites

- You can create a legacy TF emulation from source devices with a SNAP VX snapshot. In order to perform this operation:
  - A SNAP VX storage group with a snapshot must already exist.
  - A device group must already have been created from this storage group.
  - The device group must also have enough candidate target devices to create the required TF emulation session.
  - See Roles and associated permissions to determine the user roles that can perform this task.

## About this task

The wizard automatically creates target volumes when the source Storage Group contains CKD volumes.

## Steps

1. Select the storage system.
2. Select DATA PROTECTION > Device Groups.
3. Click the Device Groups tab to open the Device Group list view.
4. Click Create to open the Create Device Group wizard.
5. Type a Device Group Name.
6. Select a Device Group Type.
   Possible values are:
   - REGULAR—Group can only contain REGULAR volumes.
   - RDF1—Group can only contain R1 volumes.
   - RDF2—Group can only contain R2 volumes.
   - RDF21—Group can only contain R21 volumes.
   - ANY—Group can contain any volume type.
7. Click Next.
8. Select the Source of the volumes to use when creating the group; either manual selection, or all the volumes in a storage group.
9. Do the following, depending on the source of the volumes:
   - Manual selection:
     1. Select the Source Volume Type.
     2. Select one or more volumes and click Add.
   - Storage group:

     Type or select the name of the Storage Group.

10. Click NEXT.
11. Select how to specify the Target Volumes, either manually or automatically.
12. Do the following, depending on how you are specifying the target volumes:
    - Automatically:
      1. Optional: Select to replicate the source volumes using TimeFinder Mirror (not supported by storage systems running PowerMaxOS 10 (6079)) or TimeFinder/Clone . The required devices (if they are not found to be already existing and unused) are created. The BCV devices are automatically created for the TimeFinder/Mirror device group. The required devices are automatically created for the TimeFinder/Clone device group.
      2. If you are replicating the source volumes with TimeFinder/Clone, select whether to add BCV or Standard volumes to the device group. The volumes are added with the TGT flag.
    - Manually:
      1. Click NEXT.
      2. Select the Target Volume Type.
      3. Select one or more volumes and click Add.
13. Click NEXT.
14. Verify your selections in the Summary page. To change any of your selections, click Back. The changes may require you to make additional changes to your configuration.
15. Click FINISH.

## Results

A window appears that displays the progress of the tasks that the wizard performs.