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# Add SRDF Virtual Witness instances

The Virtual Witness feature supports a third party that the two storage systems consult when they lose connectivity with each other, that is, their SRDF links go out of service.

## Prerequisites

Unisphere provides monitoring and management for SRDF/Metro Virtual Witness instances on Virtual Witness capable storage systems running HYPERMAX OS 5977 Q3 2016 or later.

A Virtual Witness instance must be created for both participating storage systems.

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

## About this task

See Understanding Virtual Witness for additional information.

## Steps

1. Select the storage system.
2. Select DATA PROTECTION > Virtual Witness to open the Virtual Witness list view.
3. Click Create.
4. Type values for the following:
   - Virtual Witness Name—User-defined Virtual Witness instance name
   - IP/DNS—IPv4 or IPv6 address, or the DNS name from embedded guest that is associated with Virtual Witness instance.
5. Optional: Select the Add Virtual Witness to remote arrays checkbox and select the arrays (these storage systems support the Virtual Witness functionality) that are to have the same Virtual Witness added.
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.

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