Once you have a replica 3, upgrade one of the nodes and follow a rolling update approach.
Keep in mind that you have to check the release notes as some options were deprecated.
I would go 6-> 7-> 8 -> 9 -> 10 as this is the most tested scenario but reading the release notes can help you identify which versions you can skip.
According to https://docs.gluster.org/en/main/Upgrade-Guide/upgrade-to-9/ upgrade from 6.Latest to 9.x should be possible but without debug logs , it's hard to understand why it happened.
On Wed, May 25, 2022 at 9:58, Stefan Kania<stefan@xxxxxxxxxxxxxxx> wrote:Hello,we have a gluster volume (replica 3). We removed one node and detachedthe peer, running gluster6 on ubuntu 18.04.gluster v remove-brick gv1 replica 2 c3:/gluster/brick forcegluster peer detach c3We installed ubuntu 20.04 and gluster9We than had a volume with two nodes up ad running. We replaced the HDswith SSDs reformated the disk with xfs. Then we did agluster peer probe c3to add the brick, that works "gluster peer status" and "gluster poollist" is showing the brick. Trying to add the brick with:gluster v add-brick gv1 replica 3 c3:/gluster/brickgives us the following error:volume add-brick: failed: Pre Validation failed on c3. Please check logfile for details.But we only found the same errormesage in the log. Then we checked thestatus of the volume and got:gluster v status gv1Staging failed on c3. Error: Volume gv1 does not existSo the volume crashes. A "gluster v info" is showing:root@fs002010:~# gluster v infoVolume Name: gv1Type: ReplicateVolume ID: b93f1432-083b-42c1-870a-1e9faebc4a7dStatus: StartedSnapshot Count: 0Number of Bricks: 1 x 2 = 2Transport-type: tcpBricks:Brick1: c1:/gluster/brickBrick2: c2:/gluster/brickOptions Reconfigured:nfs.disable: onAs soon as we detach c3 the volume status is OK, without restarting glusterdWhat might be the problem? Adding gluster9 to a gluster6 volume? Thename resolution is using /etc/hosts so all 3 hosts in all 3 /etc/hostsfile and can be reached via ping.Any help?Stefan________
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