[Gluster-users] 3.3.0 -> 3.4.2 / Rolling upgrades with no downtime

[João Pagaime]

Hello all

anyone tried a  rolling upgrades with no downtime [1] from 3.3.0 to 
3.4.2 or similar upgrade? any comments?

for testing purposes we've installed a 3.4.2 server and it won't peer, 
giving the error "peer probe: failed: Peer X does not support required 
op-version".

I guess this is expected behavior for a new entry on the cluster

What about changing the software on an existing peer of the cluster? 
Will it also refuse to re-enter the cluster after the upgrade for the 
same reason (peers not supporting the required op-version)?

After all servers and clients are upgraded, how to increase the 
op-version of the global cluster?

best regards,
joão

[1]
http://vbellur.wordpress.com/2013/07/15/upgrading-to-glusterfs-3-4/