Gluster users - Jan 2017 - High-availability with KVM?

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
PGP Fingerprint : 89A5 2283 04A0 E6E9 0111
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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
> PGP Fingerprint : 89A5 2283 04A0 E6E9 0111
>
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> Gluster-users mailing list
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