Mount failed on RHEV client from RHS 3.0 node with the error message in "/var/log/glusterfs" as "Server is operating at an op-version which is not supported"

Issue

• Mount failed on RHEV client from RHS 3.0 node with the error message in
  /var/log/glusterfs as "Server is operating at an op-version which is
  not supported"

~snip from glusterfs logs /var/log/glusterfs from RHS client,

[2014-12-31 06:32:14.735916] W [common-utils.c:2513:gf_ports_reserved] 0-glusterfs-socket: 54321 is not a valid port identifier
[2014-12-31 06:32:14.737903] E [glusterfsd-mgmt.c:1369:mgmt_getspec_cbk] 0-glusterfs: failed to get the 'volume file' from server
[2014-12-31 06:32:14.737984] E [glusterfsd-mgmt.c:1460:mgmt_getspec_cbk] 0-mgmt: Server is operating at an op-version which is not supported   <<========