[Gluster-users] High-availability with KVM?

Ziemowit Pierzycki ziemowit at pierzycki.com
Fri Jan 20 22:12:19 UTC 2017

Can't afford downtime...

I see starting with version 3.8 I can add them while they're online,
but when I try I get:

gluster> v add-brick virt0 replica 3 arbiter 1 dalpinfglt01:/vol/virt/arbt0
volume add-brick: failed: Operation failed

Can I not add a brick that is already used in volume just a different location?

On Fri, Jan 20, 2017 at 4:05 PM, Kevin Lemonnier <lemonnierk at ulrar.net> wrote:
> Ah yeah, I did wonder about that but I thought quorum was based on all
> bricks, not just the replica set. Guess my first instinct was right !
>> I see.  So if I switch to a different cluster quorum model, I may get
>> split-brain which would need manual intervention should a node go
>> missing?
> Yes
>> Adding an arbiter involves creating a volume from scratch?  You can't
>> just add it to an existing volume.
> You can, I think in your case you'd need to remove 2 nodes (removing the
> distributed part), then add a brick to go to replica 3, then you should
> be able to add the two arbiters at once.
> If you can afford downtime creating a new volume is clearly a lot simpler :)
> --
> Kevin Lemonnier
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