[Gluster-users] Change underlying brick on node

[David Gossage]

On Mon, Aug 8, 2016 at 4:23 PM, Joe Julian <joe at julianfamily.org> wrote:

>
>
> On 08/08/2016 01:39 PM, David Gossage wrote:
>
> So now that I have my cluster on 3.7.14 and sharded and working I am of
> course looking for what to break next.
>
> Currently each of 3 nodes is on a 6 disk (WD Red 1TB) raidz6 (zil on
> mirrored ssd), which I am thinking is more protection than I may need with
> a 3 way replica.  I was going to one by one change them to basically raid10
> letting it heal in between.
>
> Is best way to do that a systemctl stop glusterd, should I just kill the
> brick process to simulate a brick dying, or is their an actual brick
> maintenance command?
>
>
> Just kill (-15) the brick process. That'll close the TCP connections and
> the clients will just go right on functioning off the remaining replica.
> When you format and recreate your filesystem, it'll be missing the
> volume-id extended attributes so to start it you'll need to force it:
>
>    gluster volume start $volname start force
>

If I left volume started when brick process is killed and clients are still
(in theory) connected to volume wouldn't that just give me an error that
volume is already started?


Likely I would shut down the volume and do downtime for this anyway though
letting heals go on with VM's off.


>
> If /etc/glusterfs is unchanged and /var/lib/glusterd is unchanged will
> doing a heal full after reboot or restarting glusterd take care of
> everything if I recreate the expected brick path first?
>
>
> Once started, perform a full heal to re-replicate.
>
>
> Are the improvements in 3.8 for sharding significant enough I should first
> look at updating to 3.8.2 when released in few days?
>
>
> Yes.
>
>
>
> *David Gossage*
> *Carousel Checks Inc. | System Administrator*
> *Office* 708.613.2284
>
>
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