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# View storage group SRDF relationships

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

Beginning in 9.2, Unisphere supports a storage group tabbed details view that has an extra SRDF tab that represents any SRDF relationship that the Storage Group is part of, including Hop2 information. The view enables you to perform active management on the SRDF relationships.

The SRDF tab is visible if the array is SRDF licensed and capable. In the list view under the SRDF tab, each of the rows represent one leg of the SRDF relationship. If the storage group is part of a concurrent SRDF setup, two rows are visible in the list view, where each row represents one leg of the SRDF setup. If the storage group is part of cascaded SRDF setup, the Hop 2 leg is a child row of the first SRDF hop. The row is a parent or child folder on the list view, like other list views in the product. If you select a Hop 2 leg and perform active management on the leg, the SRDF group number of the first hop is sent in the command. The hop2 flag in the dialog is selected and disabled. If you select the first hop of a cascaded setup, or a single hop leg, the dialog behaves as it does for storage group SRDF active management.

## Steps

1. Select the storage system.
2. Select STORAGE > Storage Groups.
3. Select an SRDF protected storage group.
4. Click Yes next to SRDF in the details panel or click VIEW ALL DETAILS.
5. Click the SRDF tab.
   The following properties display, depending on the operating environment:
   - Remote Array ID—The 12-digit numeric identity of the remote array
   - SRDF Group Number—The number of the SRDF group that the SRDF leg is using.
   - Mode—The SRDF Mode of the leg relationship
   - States—The SRDF states of the SRDF leg relationship - possible values are:
     - ActiveActive
     - ActiveBias
     - Consistent
     - Failed Over
     - Invalid
     - Partitioned
     - R1 Updated
     - R1 Update in progress
     - Suspended
     - Synchronization in progress
     - Synchronized
     - Transmit Idle
   - SRDF Type—The polarity of the leg of the SRDF relationship
   - Capacity (GB)—Capacity (in GB) of all devices in the SRDF leg

   Click (if the Details panel is not already displayed) to view the details.

   A graphic displaying the replication configuration is displayed. It shows the following items:

   - Containers representing the R1 and R2 volumes. The color of the container indicates the status of the container:
     - Read write enabled
     - Write disabled
     - Connectivity lost
   - An arrow indicating the direction of I/O
   - A central icon and label indicating the state of the replication pair.
     - Synchronized, Consistent, ActiveActive, ActiveBias
     - Synchronization in progress
     - Suspended, Split, Failed Over
     - Unknown
     - Partitioned, Transmit Idle

   The following properties are displayed:

   - States—The SRDF states of the SRDF leg relationship - possible values are:
     - ActiveActive
     - ActiveBias
     - Consistent
     - Failed Over
     - Invalid
     - Partitioned
     - R1 Updated
     - R1 Update in progress
     - Suspended
     - Synchronization in progress
     - Synchronized
     - Transmit Idle
   - Mode—The SRDF Mode of the leg relationship
   - SRDF Group Number—The number of the SRDF group that the SRDF leg is using.
   - Capacity (GB)—Capacity (in GB) of all devices in the SRDF leg
   - SRDF Pairs—The number of SRDF pairs in the leg
   - Group Type—The polarity of the leg of the SRDF relationship

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

   - Establish— Establish SRDF pairs
   - Split— Split SRDF pairs
   - Suspend— Suspend SRDF pairs
   - Restore — Restore SRDF pairs
   - Resume— Resume SRDF links
   - Failover— Failover
   - Failback— Failback
   - Swap— Swap SRDF personalities
   - Move— Move SRDF pairs
   - Delete Pair— Delete SRDF pairs
   - Set Mode— Set SRDF mode
   - Set Bias— Set bias location
   - Set Volume Attributes > Invalidate— Invalidate R1 or R2 volumes
   - Set Volume Attributes > Ready— Make R1 or R2 volumes ready
   - Set Volume Attributes > Not Ready— Make R1 or R2 volumes not 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 R2s— Read or Write disable R2 volumes
   - Set Volume Attributes > Refresh— Refresh R1 or R2 volumes
   - Asynchronous > Set SRDF/A— Set SRDF/A controls to prevent cache overflow
   - Asynchronous > Set Consistency— Set consistency protection