[Gluster-users] Replace brick of a dead node

[Mohit Anchlia]

On Fri, Aug 12, 2011 at 2:35 PM, Rajat Chopra <rchopra at redhat.com> wrote:
>
> Thank you Harsha for the quick response.
>
> Unfortunately, the infrastructure is in the cloud. So, I cant get the dead node's disk.
> Since I have replication 'ON', there is no downtime as the brick on the second node serves well, but I want the redundancy/replication to be restored with the introduction of a new node (#3) in the cluster.

One way is http://gluster.com/community/documentation/index.php/Gluster_3.2:_Brick_Restoration_-_Replace_Crashed_Server

Other way is to use replace-brick. You should be able to use it even
if the node is dead.

>
> I would hope there is a gluster command to just forget about the dead node's brick, and pick up the new brick and start replicating/serving from the new location (in conjunction with the one existing brick on the #2 node). Is that the self heal feature? I am using v3.11 as of now.
>
> Rajat
>
>
>
>
> ----- Original Message -----
> From: "Harshavardhana" <harsha at gluster.com>
> To: "Rajat Chopra" <rchopra at redhat.com>
> Cc: gluster-users at gluster.org
> Sent: Friday, August 12, 2011 2:06:14 PM
> Subject: Re: [Gluster-users] Replace brick of a dead node
>
>> I have a two node cluster, with two bricks replicated, one on each node.
>> Lets say one of the node dies and is unreachable.
>
> If you have the disk from the dead node, then all have to do is plug
> it in new system and start running following commands.
>
> gluster volume replace-brick <volname> <old-brick> <new-brick> start
> gluster volume replace-brick <volname> <old-brick> <new-brick> commit
>
> You don't have to migrate the data, this works as expected.
>
> Since you have a replicate you wouldn't see a downtime,  but mind you
> self-heal will kick in as of 3.2 it will be blocking, wait for 3.3 you
> have non-blocking self-healing capabilities.
>
>> I want to be able to spin a new node and replace the dead node's brick to a location on the new node.
>
> This is out of Gluster's hand, if you already have mechanisms to
> decommission a brick and reattach it on new node then above steps are
> fairly simple.
>
> Go ahead and try it, it should work.
>
> -Harsha
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