After upgrading my cluster from 3.7.5 to 3.7.9 I got the following error when I 
tried to enable quotas:

"quota command failed : Volume quota failed. The cluster is operating at 
version 30702. Quota command enable is unavailable in this version."

After a brief search, I discovered the following solution for RHGS: 
https://access.redhat.com/solutions/2050753 It suggests updating the op-version 
of the cluster after the upgrade. There isn't any evidence of this procedure in 
the community documentation (except for in this mailing list).

Unfortunately, nor 30709 or 30708 are valid op-version so I moved to 30707:

[root@s20 ~]# cat /var/lib/glusterd/glusterd.info
UUID=46ec7bcf-adf0-4846-a830-3d8205e96e89
operating-version=30702

[root@s20 ~]# gluster volume set all cluster.op-version 30709
volume set: failed: Required op_version (30709) is not supported

[root@s20 ~]# gluster volume set all cluster.op-version 30708
volume set: failed: Required op_version (30708) is not supported

[root@s20 ~]# gluster volume set all cluster.op-version 30707
volume set: success

[root@s20 ~]# cat /var/lib/glusterd/glusterd.info
UUID=46ec7bcf-adf0-4846-a830-3d8205e96e89
operating-version=30707

What is the corresponding op-version for a glusterfs release? RHGS has the 
following solution that I found really useful, matching releases to the 
suggested op-version: https://access.redhat.com/solutions/543123 Where do I can 
find such information for the community version of glusterfs?

Thank you very much for your help. 

Regards,
-- 
Stefano Stagnaro

Prisma Telecom Testing S.r.l.
Via Petrocchi, 4
20127 Milano – Italy

Tel. 02 26113507 int 339
e-mail: stefa...@prismatelecomtesting.com
skype: stefano.stagnaro

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