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# Swap SRDF groups

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

## Prerequisites

Before you begin:

- See Roles and associated permissions to determine the user roles that can perform this task.
- If the target (R2) volume is on a storage system running HYPERMAX OS 5977 or PowerMaxOS 5978 and the mode of the source (R1) volume is Adaptive Copy Write Pending, SRDF sets the mode to Adaptive Copy Disk.
- As a result of a swap operation, a cascaded R1 -> R21 -> R2 configuration can be created if any of the storage systems in the cascaded configuration is running HYPERMAX OS Q1 2015 SR or later.

## About this task

When you swap the SRDF personality of the designated SRDF volumes, the source (R1) volumes become target (R2) volumes and the target (R2) volumes become source (R1) volumes.

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 swap SRDF groups:

## 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 an SRDF group, click , and select Swap Groups.
4. Select the mirror to refresh.
5. Optional: Select the Half Swap checkbox to indicate if a half swap is required.
6. Click Advanced Options and select one of the advanced options.
   If the SRDF group you are swapping is part of an SRDF/Star configuration, select Star.
7. 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.