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3.1
Configuring Red Hat Enterprise Virtualization with Red Hat Gluster Storage
Chapter 6. Recommended Best Practices and Troubleshooting

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_Storage/3.1/html/Administration_Guide/sect-Managing_Split-brain.html#sect-Preventing_Split-brain.
Red Hat Gluster Storage Volumes that serve as Red Hat Enterprise 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_Storage/3.1/html/Administration_Guide/sect-Managing_Split-brain.html#sect-Preventing_Split-brain.
To reduce the risk of split-brain conditions developing in the cluster, Red Hat recommends using three-way replication when you create Red Hat Gluster Storage volumes. This involves setting replica 3 when creating replicate volumes, or replica count 3 when creating distributed-replicated volumes.

6.1. Troubleshooting the Integration
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Red Hat Gluster Storage 3.1 Volumes do not get mounted with Red Hat Enterprise Virtualization Hypervisor 3.3 and 3.4 versions as the glusterfs native clients available in those Hypervisors are not compatible with Red Hat Gluster Storage 3.1 servers.
In order to make use of Red Hat Gluster Storage 3.1 volumes in Red Hat Enterprise Virtualization Hypervisor 3.3 and 3.4 versions, disable the readdir-ahead option on those volumes. This makes the volumes compatible with the older native client available with Red Hat Enterprise Virtualization Hypervisor 3.3 and 3.4.
```
# gluster volume set <vol> readdir-ahead off
```

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