[Gluster-users] Replace brick of a dead node

[Rajat Chopra]

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. 

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