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# View SRDF volume 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

This procedure explains how to view and manage the volume pairs in an SRDF group.

## Steps

1. Select the storage system.
2. Select Data Protection > SRDF.
3. Select a device group from the list and click to open the SRDF Pair List view.

   The following properties display:

   Show Group Details:

   Displays the following device group properties:

   Group Valid—Indicates if device group is valid or invalid for SRDF management.

   Application ID—Application name managing SRDF actions.

   Vendor ID—Vendor name

   Group Creation Time—Group creation timestamp

   Group Modify Time—Group modification timestamp

   Remote Array—Remote storage system ID

   Volume Pacing Exempt State—Indicates if volume pacing exempt is enabled.

   Write Pacing Exempt State—Indicates if write pacing exempt is enabled.

   Effective Write Pacing Exempt State—Indicates if effective write pacing exempt is enabled.

   Local tab:

   Displays the following local SRDF link properties:

   Source Volume—Source volume ID

   Source LDev—Source logical volume ID

   Group—SRDF group ID

   Remote Array—Remote storage system ID

   Target Volume—Target volume ID

   State—State of the SRDF volume pairs.

   Volume State—State of the source volume.

   Remote Volume State—State of the remote volume.

   SRDF Mode—SRDF copy type

   Local R1 Invalid—Number of invalid R1 tracks on the source volume.

   Local R2 Invalid—Number of invalid R2 tracks on the source volume.

   Remote R1 Invalid—Number of invalid R1 tracks on the target volume.

   Remote R2 Invalid—Number of invalid R2 tracks on the target volume.

   Hop2 tab:

   Displays the following remote SRDF link properties:

   Source LDev—Source logical volume ID

   Concurrent Volume—Concurrent volume ID

   SRDF Group—SRDF group ID

   Remote Array—Remote storage system ID

   Target Volume—Target volume ID

   State—State of the SRDF volume pairs.

   Volume State—State of the source volume.

   Remote Volume State—State of the remote volume.

   The following controls are available:

   —View SRDF volume pair details

   Establish— Establish SRDF pairs

   Split— Split SRDF pairs

   Suspend— Suspend SRDF pairs

   Restore— Restore SRDF pairs

   Resume— Resume SRDF links

   Failover— Failover

   Failback— Failback

   Set SRDF/A— Set SRDF/A controls to prevent cache overflow

   Invalidate— Invalidate R1 or R2 volumes

   Ready— Make R1 or R2 volumes ready

   Not Ready— Make R1 or R2 volumes not ready

   R1 Update— Update R1 volumes

   RW Enable— Read or Write Enable R1 or R2 Volumes

   Write Disable— Read or Write disable R1 or R2 volumes

   RW Disable R2— Read or Write disable R2 volumes

   Refresh— Refresh R1 or R2 volumes

   Set Mode— Set SRDF mode