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# Set SRDF/A pace attributes

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.

## Steps

1. Select a storage system.
2. Select DATA PROTECTION > SRDF Groups.
3. Select a group, click , and select SRDF/A Pacing Setting.
4. Type the maximum I/O delay to apply to each host write I/O when the pacing algorithm is invoked (Pacing Delay). Possible values range from 1 to 1,000,000 micro seconds (0.000001 s to 1 s), with 50,000 (0.05 s or 50 milliseconds) being the default.
5. Type the minimum cache percentage when host write pacing begins (Threshold). Possible values range from 1 to 99, with 60% being the default .
6. Optional: Select to set the threshold on both the R1 and R2 sides (Both Sides).
7. Optional: Set the following write pacing attributes for the SRDF group, the volumes in the group, or both:
   1. Select (enable) the SRDF/A write pacing feature to automatically start when an SRDF/A session is activated (Autostart Group Pacing and Autostart Volume Pacing). This feature must be activated in order to invoke host write I/O pacing.
   2. Manually Activate/Deactivate the SRDF/A write pacing feature for the SRDF group. Setting this option to No Change leaves the current write pacing setting.

   SRDF/A write pacing can only be activated when the SRDF/A session is active.

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.