[Gluster-users] Upgrading from Gluster 3.8 to 3.12

[Atin Mukherjee]

On Tue, Dec 19, 2017 at 1:10 AM, Ziemowit Pierzycki <ziemowit at pierzycki.com>
wrote:

> Hi,
>
> I have a cluster of 10 servers all running Fedora 24 along with
> Gluster 3.8.  I'm planning on doing rolling upgrades to Fedora 27 with
> Gluster 3.12.  I saw the documentation and did some testing but I
> would like to run my plan through some (more?) educated minds.
>
> The current setup is:
>
> Volume Name: vol0
> Distributed-Replicate
> Number of Bricks: 2 x (2 + 1) = 6
> Bricks:
> Brick1: glt01:/vol/vol0
> Brick2: glt02:/vol/vol0
> Brick3: glt05:/vol/vol0 (arbiter)
> Brick4: glt03:/vol/vol0
> Brick5: glt04:/vol/vol0
> Brick6: glt06:/vol/vol0 (arbiter)
>
> Volume Name: vol1
> Distributed-Replicate
> Number of Bricks: 2 x (2 + 1) = 6
> Bricks:
> Brick1: glt07:/vol/vol1
> Brick2: glt08:/vol/vol1
> Brick3: glt05:/vol/vol1 (arbiter)
> Brick4: glt09:/vol/vol1
> Brick5: glt10:/vol/vol1
> Brick6: glt06:/vol/vol1 (arbiter)
>
> After performing the upgrade because of differences in checksums, the
> upgraded nodes will become:
>
> State: Peer Rejected (Connected)
>

Have you upgraded all the nodes? If yes, have you bumped up the
cluster.op-version after upgrading all the nodes? Please follow :
http://docs.gluster.org/en/latest/Upgrade-Guide/op_version/ for more
details on how to bump up the cluster.op-version. In case you have done all
of these and you're seeing a checksum issue then I'm afraid you have hit a
bug. I'd need further details like the checksum mismatch error from
glusterd.log file along with the the exact volume's info file from
/var/lib/glusterd/vols/<volname>/info between both the peers to debug this
further.


> If I start doing the upgrades one at a time, with nodes glt10 to glt01
> except for the arbiters glt05 and glt06, and then upgrading the
> arbiters last, everything should remain online at all times through
> the process.  Correct?
>
> Thanks.
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>
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