[Bugs] [Bug 1429200] New: disallow increasing replica count for arbiter volumes

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1429200

            Bug ID: 1429200
           Summary: disallow increasing replica count for arbiter volumes
           Product: GlusterFS
           Version: mainline
         Component: arbiter
          Assignee: bugs at gluster.org
          Reporter: ravishankar at redhat.com
                CC: bugs at gluster.org



Problem: add-brick command to increase replica count in an arbiter
    volume succeeds, causing undesirable effects like the 4th brick being
    loaded with the arbiter xlator, the 3rd one losing the arbiter xlator
    (when the brick process is restarted), arbitration logic in afr going
    for a toss etc.

    Fix: Arbiter configuration should always be a replica 3 volume (of
    which 3rd brick is arbiter). Hence disallow increasing replica count for
    arbiter volume configurations.

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