[Gluster-users] replace brick in distributed-dispersed setup

[itlinux_team]

Hi Ashish,

It was an error on my side, nothing gluster related. The kernel version 
I was running had a bug that prevented the fuse module from loading and 
causing the brick replacement errors. After upgrading I can confirm that 
the process of replacing the brick works fine both with the brick to be 
replaced online or after killing the brick process.

I have a question though. In a real (non virtual) server, if I setup the 
server in JBOD mode, and a drive fails, does gluster kill the brick pid?

Regards,
Iñaki.

On 07/08/2016 07:03 AM, Ashish Pandey wrote:
>
> Hi Iñaki
>
> The steps you are following don't have any issue.
> I would like to have more information to debug this further.
>
> 1 - gluster v info <volname>
> 2 - gluster v status <volname> before and after running replace-brick
> 3 - Brick logs (for this volume only) from /var/log/glusterfs/bricks/
> 4 - glusterd logs /var/log/glusterfs/  starts with 
> "usr-local-etc-glusterfs-glusterd-<volname>"
>
> Although it should not matter,  could you also try to replace a brick 
> without killing that brick process?
>
> Ashish
>
> ------------------------------------------------------------------------
> *From: *"itlinux_team" <itlinux at imppc.org>
> *To: *gluster-users at gluster.org
> *Sent: *Wednesday, July 6, 2016 4:33:54 PM
> *Subject: *[Gluster-users] replace brick in distributed-dispersed setup
>
> Hi all,
>
> I'm doing some testings with glusterfs in a virtualized environment
> running a 3 x (8 + 4) distributed-dispersed volume simulating a 3 node
> cluster with 12 drives per node configuration. The system versions are:
>
> OS: Debian jessie kernel 3.16
>
> Gluster:  3.8.0-2 installed from the gluster.org debian repository
>
> I have tested the node failure scenario while some clients are running
> some read/write operations and the setup works as expected. Now I'm
> trying to test how to replace a faulty drive on this setup, however I'm
> not able to replace a brick. To test it I have:
>
> 1: Find the pid of the brick I'd like to 'fail' and kill the process.
> (tried removing the drive from the host but that would make the whole
> guest unresponsive)
>
> 2: Attach a new virtual drive, format and mount it
>
> 3: Try the gluster volume replace-brick command
>
> And I'm getting the following error:
>
> gluster volume replace-brick vol_1 glusterserver1:/ext/bricks/brick-1
> glusterserver1:/ext/bricks/brick-13 commit force
> volume replace-brick: failed: Fuse unavailable
>   Replace-brick failed
>
> I assume I'm doing something wrong but don't know what exactly. Looking
> in the documentation I have not found information about brick
> replacement in distributed-dispersed setups.
>
>
> Thanks!
>
> Iñaki
>
>
>
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