2.2. Deprecated Features

As of Red Hat Gluster Storage 3.3, two-way replication is considered deprecated. Two-way replication remains supported for this release, but Red Hat no longer recommends its use, and plans to remove support in future versions of Red Hat Gluster Storage. This change affects both replicated and distributed-replicated volumes.

Two-way replication is being deprecated because it does not provide adequate protection from split-brain conditions. Even in distributed-replicated configurations, two-way replication cannot ensure that the correct copy of a conflicting file is selected without the use of a tie-breaking node.

While a dummy node can be used as an interim solution for this problem, Red Hat recommends that all volumes that currently use two-way replication are migrated to use either arbitrated replication or three-way replication.

For instructions to migrate a two-way replicated volume to an arbitrated replicated volume, see Converting to an arbitrated volume in the Red Hat Gluster Storage 3.3 Administration Guide.

Further information about replicated and arbitrated replicated volumes is also available in the Red Hat Gluster Storage 3.3 Administration Guide:

As of Red Hat Gluster Storage 3.3, new installations using NFS-Ganesha on Red Hat Enterprise Linux 6 based Red Hat Gluster Storage is not supported. Existing Red Hat Enterprise Linux 6 based installations are advised to migrate to Red Hat Enterprise Linux 7 based Red Hat Gluster Storage in order to continue receiving updates for NFS-Ganesha.