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# Unplanned Failover (DR) of a file protection replication session

Network-attached storage is a file-level storage architecture that makes stored data more accessible to networked devices.

## About this task

See Understanding PowerMax File for storage systems for an overview of PowerMax File.

In the event of a primary site failure due to unplanned environmental catastrophes or any system failures, the external NFS/CIFS clients that are using the file system(s) served by the NAS-server active on the primary site experience a Data Unavailability (DU) situation. In such scenarios, the Administrator can run the replication failover option to quickly mitigate the DU scenario.

| NOTE: This operation is performed on the destination site in case of a disaster (source site unavailable). Start needs to be performed after the original source is brought up.

This operation will reverse the direction of the replication session and makes the NAS server in production mode on the original destination.

If any failure occurs during an Unplanned Failover of replication session, the Replication Session enters the PartialFailedover workflow. This partial state allows you to complete the unplanned failover workflow by retrying the same workflow again.

## Steps

1. Select a storage system that supports PowerMax File.
2. Select Data Protection > File Protection.
3. Select REPLICATION > REPLICATION SESSION.
4. Select a session, click , and click Unplanned Failover (DR).
5. Do one of the following:
   - Expand Run In The Background, and click Run In The Background to perform the operation in the background.
   - Expand Run In The Background, 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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