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

[Bryan Whitehead]

I followed this blog: http://geekshell.org/~pivo/glusterfs-split-brain.html
(this can take too long because of using "find" if you have many files)

Right after Joe Julian released a pretty handy system for exploring the
split brains and fixing. You can check it out here:
http://joejulian.name/blog/glusterfs-split-brain-recovery-made-easy/
https://github.com/joejulian/glusterfs-splitbrain



On Wed, Mar 5, 2014 at 1:40 AM, João Pagaime <joao.pagaime at gmail.com> wrote:

>  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>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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>>
>
>
>
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