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# Modify SRDF groups

SRDF groups provide a collective data transfer path linking volumes of two separate storage systems.

## Prerequisites

See Roles and associated permissions to determine the user roles that can perform this task.

## About this task

To modify SRDF groups:

## Steps

1. Select the storage system.
2. Select DATA PROTECTION > SRDF Groups to open the SRDF groups list view.
3. Select a group and click Modify.
4. Do any number of the following steps:
   1. Select a new Local Array through which the group communicates.

      When specifying a local or remote array for a storage system , you can select one or more SRDF ports.

   2. Select a new Remote Array through which the group communicates.
5. Select Advanced Options and do any number of the following steps:
   1. Select a local Link Limbo Period. The length of time for the storage system to continue checking the local SRDF link status. (The range is 0-120 s, default is 10 s.) If the link status is Not Ready after the link limbo time, the volumes are made Not Ready to the link.
   2. Select (enable) Link Domino for the local group. When this feature is enabled from either the local or remote side of the group's SRDF links, failure of the group's last remaining link makes all source (R1) volumes in the group unavailable (not ready) to their host when an R1-side operation occurs. This ensures that the data on the source (R1) and target (R2) devices is always in synch.
   3. Select (enable) Auto Link Recovery for the local group. When this feature is enabled, once the link failure is corrected, volumes that were ready to their host before the failure are automatically restored to the ready state.
   4. Select (enable) Software Compression for the local group - enables SRDF software data compression for SRDF groups that are defined on GigE, or Fibre Channel. You can enable or disable software compression on the R2 side, but the setting of hardware compression on the R1 side is what enables or disables the feature.
   5. Select (enable) Hardware Compression for the local group -enables SRDF hardware data compression on an SRDF group that is defined on a GigE director. You can enable or disable software compression on the R2 side, but the setting of hardware compression on the R1 side is what enables or disables the feature.
   6. Select a remote Link Limbo Period - a length of time for the storage system to continue checking the remote SRDF link status. (The range is 0-120 s, default is 10 s.) If the link status is Not Ready after the link limbo time, the volumes are made Not Ready to the link.
   7. Select (enable) Link Domino for the remote group. When this feature is enabled from either the local or remote side of group's SRDF links, failure of the group's last remaining link makes all source (R1) volumes in the group unavailable (not ready) to their host when an R1-side operation occurs. This ensures that the data on the source (R1) and target (R2) volumes is always in synch.
   8. Select (enable) Auto Link Recovery for the remote group. When this feature is enabled, once the link failure is corrected, volumes that were ready to their host before the failure are automatically restored to the ready state.
6. Do one of the following:
   - Click Run Now to perform the operation now.
   - Expand Run Now and click Add to Job List to add this task to the job list, from which you can schedule or run the task at your convenience. For more information, see Schedule jobs and Preview jobs.