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

[João Pagaime]

hello Bryan and thanks for sharing!

how did you fix those 2 files on a  split-brain situation? deleted one 
"bad" file?
which one to select for deletion?

on an software update situation I would expect not to have peer probe 
problems, simply because there are no "gluster peer probe" commands. The 
problem that could happen is the updated 3.4.2 node having problems 
reentering a  3.3.0 cluster (without "peer probes" commands). It's good 
news it went well

best regards
joao

Em 04-03-2014 18:30, Bryan Whitehead escreveu:
> I just did this last week from 3.3.0->3.4.2.
>
> I never got the peer probe problems - but I did end up with 2 files 
> being in a split-brain situation.
>
> Note: I only had ~hundred files that are qcow2 for KVM, so 2 files 
> getting split-brain is about 2% filesystem problem.
>
>
> On Tue, Mar 4, 2014 at 1:43 AM, João Pagaime <joao.pagaime at gmail.com 
> <mailto:joao.pagaime at gmail.com>> wrote:
>
>     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/
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