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# View SRDF protected storage group pairs

Symmetrix Remote Data Facility (SRDF) facilitates the data replication from one storage array to another through a storage area network or Internet Protocol (IP) network.

## About this task

The SRDF SG pair list displays a notification when a capacity mismatch exists between R1 and R2 devices. Mismatch can be R1 > R2 or R1 < R2.

To view SRDF group volumes, see View SRDF group volumes.

## Steps

1. Select the storage system.
2. Click Data Protection to view the Protection dashboard and select SRDF from the Protection section of the summary panel.
3. Select a storage group instance and click to open the Storage Group pair list view.
4. Click the number next to SRDF pairs to open the SRDF pair list view.

   Two tabs are displayed: Local and Hop2. The non-SRDF/Metro leg of a concurrent SRDF pair is viewable in the SRDF/Metro view. The SRDF/Metro leg of the concurrent SRDF pair is viewable in the standard SRDF view.

   The following properties display in the Local tab:

   Local Volume—The name of the local volume

   Local Type—The type of the local volume

   SRDF Group—SRDF group number

   Remote Volume—The remote volume ID

   State—The state of the storage group pair. Possible values are:

   - Consistent
   - Failed Over
   - Invalid
   - Partitioned
   - R1 Updated
   - R1 Update in progress
   - Suspended
   - Synchronization in progress
   - Synchronized
   - Transmit Idle

   If Unisphere detects an asynchronous state change event for an SRDF group from Solutions Enabler, it updates the Unisphere state for the SRDF group and its related SRDF device groups and SRDF storage groups. The Storage Group list view must be refreshed so that the latest state is reflected.

   - SRDF Mode—SRDF mode
   - Remote Array ID—Remote Array ID
   - Volume State—The state of the source volume
   - Remote Volume State —The state of the remote volume.

   The following properties display in the Hop2 tab:

   - Concurrent Volume—The name of the concurrent volume
   - Array ID—Storage system ID
   - SRDF Group—SRDF group number
   - Remote Array ID—Remote Array ID
   - Target Volume—The target volume ID
   - State—The state of the storage group pair. Possible values are:
     - Consistent
     - Failed Over
     - Invalid
     - Partitioned
     - R1 Updated
     - R1 Update in progress
     - Suspended
     - Synchronization in progress
     - Synchronized
     - Transmit Idle

   If Unisphere detects an asynchronous state change event for an SRDF group from Solutions Enabler, it updates the Unisphere state for the SRDF group and its related SRDF device groups and SRDF storage groups. The Storage Group list view must be refreshed so that the latest state is reflected.

   SRDF Mode—The SRDF copy mode

   The following controls are available, depending on the operating environment:

   | NOTE: You are not able to perform SRDF/Metro control actions at the storage group level on the SRDF/Metro pairs in a standard SRDF view. You are not allowed to perform standard SRDF actions on the SRDF/Metro leg in a standard SRDF view. If you are viewing a storage system that is not associated with either side of the pair of interest, you must go to the view of the relevant storage system.

   | NOTE: The dialogs that are associated with the following list of controls do not display the Use 2nd Hop option when the hop2 is SRDF/Metro.

   | NOTE: For a concurrent SRDF storage group where a leg is SRDF/Metro and a leg is not SRDF/Metro, the action launching the dialog (Metro or non-Metro) preselects the correct RDFG in the combination box and disables edits on it. The selected RDFG is the RDFG for the SRDF mode of the launching storage group.

   - —View SRDF protected storage group pair properties
   - Establish— Establish SRDF pairs
   - Split— Split SRDF pairs
   - Suspend— Suspend SRDF pairs
   - Restore— Restore SRDF pairs
   - Resume— Resume SRDF links
   - Delete Pair— Delete SRDF pairs
   - Move— Move SRDF pairs
   - Set Mode— Set SRDF mode
   - Set Volume Attributes > Invalidate— Invalidate R1 or R2 volumes
   - Set Volume Attributes > Ready— Make R1 or R2 volumes ready
   - Set Volume Attributes > R1 Update— Update R1 volumes
   - Set Volume Attributes > RW Enable— Read or Write Enable R1 or R2 Volumes
   - Set Volume Attributes > Write Disable— Read or Write disable R1 or R2 volumes
   - Set Volume Attributes > RW Disable R2— Read or Write disable R2 volumes
   - Set Volume Attributes > Refresh— Refresh R1 or R2 volumes
   - Set SRDF/A— Set SRDF/A controls to prevent cache overflow

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