> CommCell Console > Backup and Restore Agents > Snapshot Management > Supported Storage Arrays > Dell EMC PowerMax/VMAX3/VMAX/Symmetrix > Target Devices for TimeFinder Engines

TimeFinder SnapVX(SYMCLI) Engine

The Dell EMC TimeFinder SnapVX(SYMCLI) engine uses the Redirect-On-Write (ROW) technology that creates snapshots by storing changed tracks (deltas) directly on the storage resource pool (SRP) of the source device.

A single source volume can have a maximum of 256 snapshots.

Target Devices

Target device selection for mounting a snapshot for operations like restore and backup copy is restricted to the storage group. You can specify the storage group in the snapshot configuration Use SnapVX target devices from storage group. For more information, see Editing the Properties of the EMC VMAX / Symmetrix Array.

For successful mount operations, do the following:

  • In the Storage > Array Management > Snap Configuration tab, provide the storage group name in the Use SnapVX target devices from storage group.

  • Ensure that the number of target devices available in storage group is same as number of snapshots being mounted. If multiple mounts are running at same time, then ensure to have required number of target devices are available in the storage group.

  • Verify that the target device is of the same size or 1.5 times of the source device (cylinder count).

    Use the following commands to verify cylinder counts.

    • To check cylinder count for a particular device

       
      #symdev -sid $[symmetrix_id]  list -dev $[device_id]  -cyl

    • To check cylinder count for all devices in a storage group

       
      #symdev -sid $[symmetrix_id] list -sg $[storage_group_name] -cyl

      Note

      If you plan to resize a source device, ensure to use target device of same size.

  • Ensure that storage group is not masked to any host or not associated to a masking view. The storage group must include a set of devices that are used only for linking a snapshot. Run the following command and verify that ‘Masking Views’ value is set to ‘No’:

    # symsg   show   -sid   symmetrix_id     storage_group_name

  • Do not associate the storage group to a storage resource pool (SRP). Run the following command and verify that ‘SRP Name’ value is set to ‘none’: 

    # symsg   show   -sid   symmetrix_id    storage_group_name

  • If multi-node backup copy is configured, then ensure that storage group of all proxy hosts (mount hosts) and target device storage group are not FAST Managed. Dell EMC PowerMAX does not support adding a device to more than one storage group in use by FAST.

    Run the following command and verify that ‘FAST Managed’ value is set to ‘No’:

    # symsg   show   -sid   symmetrix_id    storage_group_name

To edit the snapshot configuration properties, see Editing the Properties of the Dell EMC PowerMax/VMAX3/VMAX/Symmetrix Array.

×

Loading...