Chapter 6. Recommended Best Practices and Troubleshooting

Enable the server side quorum at all times for the Red Hat Gluster Storage volumes hosting virtual machine images. For more information see Configuring Server-Side Quorum in the Red Hat Gluster Storage Administration Guide: https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.3/html/administration_guide/sect-managing_split-brain#sect-Preventing_Split-brain.

Red Hat Gluster Storage Volumes that serve as Red Hat Virtualization Master Storage Domain contain SANLocks and have the Red Hat Gluster Storage volume profile set to virt. This enables the Client Side Quorum and avoids the inconsistency problems for Multiple Writer situations. For more information see Configuring Client-Side Quorum in the Red Hat Gluster Storage Administration Guide: https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.3/html/administration_guide/sect-managing_split-brain#sect-Preventing_Split-brain.

To reduce the risk of split-brain conditions developing in the cluster, Red Hat requires three-way replication when using Red Hat Gluster Storage with Red Hat Virtualization. Three-way replication is provided by three-way replicated volumes (replica 3), three-way distributed replicated volumes (replica count 3), and arbitrated replicated and distributed arbitrated replicated volumes (replica 3 arbiter 1).