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# Set SRDF/A controls to prevent cache overflow

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

## Prerequisites

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

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.

## About this task

This procedure explains how to activate or deactivate SRDF/A control actions that detect cache overflow conditions and take corrective action to offload cache or slow down the host I/O rates to match the SRDF/A service rates.

This operation can be invoked from multiple locations in the Unisphere user interface (Device group > SRDF Group, Device Group > SRDF Pairs, SG All Details > SRDF tab, Protection dashboard) . Depending on where the operation is invoked, some of the steps below may not apply.

To activate or deactivate SRDF/A controls:

## Steps

1. Select the storage system.
2. Click Protection to view the Protection dashboard and select SRDF from the Protected Storage Groups section of the summary panel.
3. Select a group, click more , and select Asynchronous > Set SRDF/A.
   For storage groups with Celerra FBA emulation, a warning dialog is displayed indicating that the storage group may be managed externally using eNAS. If you want to continue, click OK, otherwise click Cancel.
4. Select Activate SRDF/A or Deactivate SRDF/A.
5. Select the Use 2nd Hop option if including the second hop of a cascaded SRDF configuration (not applicable if the hop2 is SRDF/Metro).
6. Select Activate Type or Deactivate Type.
7. Click Advanced Options to set the advanced options. Select the advanced options and click OK.
8. 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.

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