Gluster users - Aug 2016 - Switching bricks

Hi,

I'm about to bump a 1x3 (replicated) volume up to 2x3, but I just realised
the 3 new servers
are physically in the same datacenter. Is there a safe way to switch a brick
from the first
replica set with one from the second replica set ?

The only way I see how would be to go down to replica 2, removing a brick from
the first replica,
then add 2 of the new servers as disperese (at that point the volume would be
2x2),
then go up to replica 3 adding the third one plus the one I removed earlier.
That should work, right ? There is no other "better" way of doing it ?

Thanks,
-- 
Kevin Lemonnier
PGP Fingerprint : 89A5 2283 04A0 E6E9 0111
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On Tue, Aug 30, 2016 at 5:52 PM, Kevin Lemonnier <lemonnierk at ulrar.net>
wrote:
> Hi,
>
> I'm about to bump a 1x3 (replicated) volume up to 2x3, but I just
realised
> the 3 new servers
> are physically in the same datacenter. Is there a safe way to switch a
> brick from the first
> replica set with one from the second replica set ?
>
> The only way I see how would be to go down to replica 2, removing a brick
> from the first replica,
> then add 2 of the new servers as disperese (at that point the volume would
> be 2x2),
> then go up to replica 3 adding the third one plus the one I removed
> earlier.
> That should work, right ? There is no other "better" way of doing
it ?
>
What you want to do sounds like replace-brick. From what I remember you use
sharding,so all the replace-brick changes after 3.7.3 release are already
in, so you just need to execute "gluster volume replace-brick
<VOLNAME>
<SOURCE-BRICK> <NEW-BRICK> commit force". Please make sure
new-brick has no
data. This will involve full brick healing. So you may want to wait for
that to complete before starting add-brick/rebalance. Let us know if you
find something that you don't expect in your test runs of this step.

> Thanks,
> --
> Kevin Lemonnier
> PGP Fingerprint : 89A5 2283 04A0 E6E9 0111
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users
>


-- 
Pranith
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