Hi Christian,

yes you can online and use the 3rd host as long as you don't use 
"cluster.choose-local on" as the local data is not ready yet and the FUSE 
client will first query the local brick and later query another one (extra 
lattency - less performance).
By default ovirt is disabling the choose-local, so you should be OK.

Actually, even if the gluster brick died on that host (for example the RAID is 
broken), the ovirt node can still use other Gluster bricks - just like oVirt 
compute-only nodes.

Best Regards,
Strahil Nikolov 






В четвъртък, 18 март 2021 г., 12:00:29 ч. Гринуич+2, Christian Reiss 
<em...@christian-reiss.de> написа: 





Hey folks,

quick question: I have a 3 node cluster (HC) in a production 
environment. I recently swapped all the storage SSDs with bigger 
enterprise grades SSDs. So I took a host down (migrating all VMs away, 
maintenance, shutdown, fix raid, gluster repair, back online).

This worked well and all three nodes are now hardware-wise replaced. The 
last one is still gluster-healing (roughly 20% done).  The other two 
nodes are happily serving the vms while the third one is still in 
maintenance.

my question is: Can I online the maintenance node while gluster is still 
healing? Or will will open up a can of worms I would not like? It would 
be cool having all three nodes back online soon while the gluster is 
still repairing.

We have no urge tho. If there is a risk I would wait. If this is 
somewhat risk-free and do-able why not :)

-- 
with kind regards,
mit freundlichen Gruessen,

Christian Reiss

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