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# Modify a SRDF/Metro Smart DR environment

SRDF/Metro Smart DR is a two-region high available (HA) disaster recovery (DR) solution. It integrates SRDF/Metro and SRDF/A enabling HA DR for a Metro session.

## Prerequisites

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

The storage system must be running PowerMaxOS 5978 Q3 2020 or later.

## About this task

The modify operation allows the addition or removal of devices from an existing MetroDR environment.

To modify a storage group in a smart DR environment:

## Steps

1. Select the storage system.
2. Click PROTECTION to view the PROTECTION dashboard and select SRDF/MetroDR from the High Availability section of the summary panel. Alternatively, select DATA PROTECTION > MetroDR.
3. Select a smart DR environment and click Modify.
   The Modify window is displayed.
4. Do one of the following:
   - Add volumes to a SRDF/Metro Smart DR environment
   - Remove volumes from a SRDF/Metro Smart DR environment

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