Gluster users - Nov 2017 - Help with reconnecting a faulty brick

Hi everyone.

I'm running a simple Gluster setup like this:

 ? * Replicate 2x1

 ? * Only 2 nodes, with one brick each

 ? * Nodes are CentOS 7.0, uising GlusterFS 3.5.3 (yes, I know it's old, 
I just can't upgrade right now)

No sharding or anything "fancy". This Gluster volume is used to host
VM
images, and are used by both nodes (which are gluster server and 
clients). Last week, I had a big storage issue, related to LVM (I'll 
probably post some more about it as I have other questions regarding to 
this failure), but anyway, I had data corruption, I had to disconnect 
one brick and continue on a single one. On this brick still alive, all 
the files have been modified, some renamed, some created.

Now, I need to reconnect the faulty brick. It still have data, but which 
I want to discard. I don't want to reconnect it right away because I'm 
not sure what's the state of the data on this brick for Gluster, I'd 
just like to discard everything and sync from the running brick.

I red 
http://docs.gluster.org/en/latest/Administrator%20Guide/Managing%20Volumes/#replace-faulty-brick
but my setup has some differences (I'm in pure replication mode, no 
distribution, and I'm not replacing a brick, I just want to bring back a 
previously existing one, I just want to be sure Gluster will discard its 
data and sync from the other, and not create a split brain situation)

Could I just remove the content of the brick (including the .glusterfs 
directory) and reconnect ?


I'd really like some help from GlusterFS experts here :-)


Cheers,

Daniel

-- 

Logo FWS

	*Daniel Berteaud*

FIREWALL-SERVICES SAS.
Soci?t? de Services en Logiciels Libres
Tel : 05 56 64 15 32 <tel:0556641532>
Matrix: @dani:fws.fr
/www.firewall-services.com/

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Le 13/11/2017 ? 10:04, Daniel Berteaud a ?crit?:
>
> Could I just remove the content of the brick (including the .glusterfs 
> directory) and reconnect ?
>
In fact, what would be the difference between reconnecting the brick 
with a wiped FS, and using

gluster volume remove-brick vmstore replica 1 master1:/mnt/bricks/vmstore
gluster volume add-brick myvol replica 2 master1:/mnt/bricks/vmstore
gluster volume heal vmstore full

As explained here: 
http://lists.gluster.org/pipermail/gluster-users/2014-January/015533.html

?

Cheers,
Daniel
-- 

Logo FWS

	*Daniel Berteaud*

FIREWALL-SERVICES SAS.
Soci?t? de Services en Logiciels Libres
Tel : 05 56 64 15 32 <tel:0556641532>
Matrix: @dani:fws.fr
/www.firewall-services.com/

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Le 13/11/2017 ? 21:07, Daniel Berteaud a ?crit?:
>
> Le 13/11/2017 ? 10:04, Daniel Berteaud a ?crit?:
>>
>> Could I just remove the content of the brick (including the 
>> .glusterfs directory) and reconnect ?
>>
>
> In fact, what would be the difference between reconnecting the brick 
> with a wiped FS, and using
>
> gluster volume remove-brick vmstore replica 1 master1:/mnt/bricks/vmstore
> gluster volume add-brick myvol replica 2 master1:/mnt/bricks/vmstore
> gluster volume heal vmstore full
>
> As explained here: 
> http://lists.gluster.org/pipermail/gluster-users/2014-January/015533.html
>
> ?
No one can help ?

Cheers,
Daniel

-- 

Logo FWS

	*Daniel Berteaud*

FIREWALL-SERVICES SAS.
Soci?t? de Services en Logiciels Libres
Tel : 05 56 64 15 32 <tel:0556641532>
Matrix: @dani:fws.fr
/www.firewall-services.com/

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