[Gluster-users] Replica 3 - how to replace failed node (peer)

[Strahil]

Hi Karthnik,
I used only once the brick replace function when I wanted to change my Arbiter (v3.12.15 in oVirt 4.2.7)  and it was a complete disaster.
Most probably I should have stopped the source arbiter before doing that, but the docs didn't mention it.

Thus I always use reset-brick, as it never let me down.

Best Regards,
Strahil NikolovOn Apr 11, 2019 07:34, Karthik Subrahmanya <ksubrahm at redhat.com> wrote:
>
> Hi Strahil,
>
> Thank you for sharing your experience with reset-brick option.
> Since he is using the gluster version 3.7.6, we do not have the reset-brick [1] option implemented there. It is introduced in 3.9.0. He has to go with replace-brick with the force option if he wants to use the same path & name for the new brick. 
> Yes, it is recommended to have the new brick to be of the same size as that of the other bricks.
>
> [1] https://docs.gluster.org/en/latest/release-notes/3.9.0/#introducing-reset-brick-command
>
> Regards,
> Karthik
>
> On Wed, Apr 10, 2019 at 10:31 PM Strahil <hunter86_bg at yahoo.com> wrote:
>>
>> I have used reset-brick - but I have just changed the brick layout.
>> You may give it a try, but I guess you need your new brick to have same amount of space (or more).
>>
>> Maybe someone more experienced should share a more sound solution.
>>
>> Best Regards,
>> Strahil NikolovOn Apr 10, 2019 12:42, Martin Toth <snowmailer at gmail.com> wrote:
>> >
>> > Hi all,
>> >
>> > I am running replica 3 gluster with 3 bricks. One of my servers failed - all disks are showing errors and raid is in fault state.
>> >
>> > Type: Replicate
>> > Volume ID: 41d5c283-3a74-4af8-a55d-924447bfa59a
>> > Status: Started
>> > Number of Bricks: 1 x 3 = 3
>> > Transport-type: tcp
>> > Bricks:
>> > Brick1: node1.san:/tank/gluster/gv0imagestore/brick1
>> > Brick2: node2.san:/tank/gluster/gv0imagestore/brick1 <— this brick is down
>> > Brick3: node3.san:/tank/gluster/gv0imagestore/brick1
>> >
>> > So one of my bricks is totally failed (node2). It went down and all data are lost (failed raid on node2). Now I am running only two bricks on 2 servers out from 3.
>> > This is really critical problem for us, we can lost all data. I want to add new disks to node2, create new raid array on them and try to replace failed brick on this node.
>> >
>> > What is the procedure of replacing Brick2 on node2, can someone advice? I can’t find anything relevant in documentation.
>> >
>> > Thanks in advance,
>> > Martin
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