[Gluster-users] how to downgrade GlusterFS from version 7 to 3.13?

[Amar Tumballi]

On Wed, Nov 6, 2019 at 2:05 PM Riccardo Murri <riccardo.murri at gmail.com>
wrote:

> Hello,
>
> Is there any way to downgrade a GlusterFS cluster?  Given the
> performance issues that I have seen with GlusterFS 6 and 7 (reported
> elsewhere on this mailing-list), I am now considering downgrading back
> to GlusterFS 3.13.
>
> I have set up a test cluster, copied some files on it, and tried to
> downgrade the naive way (uninstall GlusterFS 7, install GlusterFS
> 3.13, do not touch bricks or other config).  This didn't work:
> `glusterd` v3.13 complains that the o-version 70000 cannot be
> restored.
>
> So I tried again, this time trying to lower op-version before
> downgrading the system packages, but `gluster set all op-version`
> won't let me:
>
> ```
> $ sudo gluster volume set all cluster.op-version 31000
> volume set: failed: Required op-version (31000) should not be equal or
> lower than current cluster op-version (70000).
> ```
>
> What can I try next?
>
>
We don't advise downgrade, and don't test downgrade as part of any
automated tests right now.

Disclaimer: Below is not tested

Considering you have some genuine issue, and there are no new options added
with new version, try editing '/var/lib/glusterd/glusterd.info' file, and
change the op-version manually in all machines, and restart glusterd.

-Amar


> Thanks,
> Riccardo
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