Document URL: 
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https://access.redhat.com/documentation/en-US/Red_Hat_Storage/3.1/html/Administration_Guide/index.html

Section Number and Name: 
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14.6. Disaster Recovery

Describe the issue and suggestion: 
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Performing a Failover and Failback:
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When original master comes back, it will have existing geo-rep session which would become Online. Hence the first step should be to stop the existing geo-rep session:

1. Stop the existing geo-rep session from original master to orginal slave using: 

gluster volume geo-replication ORIGINAL_MASTER_VOL ORIGINAL_SLAVE_HOST::ORIGINAL_SLAVE_VOL stop <force>

2. Mention specifically to use force. 

Create a new geo-replication session with the original slave as the new master, and the original master as the new slave with force option. For more information on setting and creating geo-replication session, see Section 14.3.4.1, “Setting Up your Environment for Geo-replication Session”.