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# View 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 must be created for both participating storage systems.

## 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.

   The following properties display, depending on the operating environment:

   - Witness name—User-defined Virtual Witness instance name
   - State—State of Virtual Witness instance
   - Alive—Flag to indicate when the Virtual Witness instance is alive.
   - In Use—Flag to indicate when the Virtual Witness instance is in use.

   The following controls are available, depending on the operating environment:

   - —View SRDF virtual witnesses details
   - Create— Add SRDF Virtual Witness instances
   - Set State— Set state for SRDF virtual witness instances
   - Delete— Remove SRDF Virtual Witness instances

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