[Gluster-users] delete brick / format / add empty brick

[Alun James]

Is it normal to expect very high server load and clients being unable to access the mounts during this process? It means the application running on this will need to be offline for hours. 

----- Original Message -----

From: "Ravishankar N" <ravishankar at redhat.com> 
To: "Alun James" <ajames at tibus.com> 
Cc: gluster-users at gluster.org 
Sent: Wednesday, 8 January, 2014 2:37:05 PM 
Subject: Re: [Gluster-users] delete brick / format / add empty brick 


On 01/08/2014 05:57 PM, Alun James wrote: 



I have this a go. 


gluster volume add-brick myvol replica 2 server2:/brick1 
gluster volume heal myvol full 



It seems to be syncing the files but very slowly. Also the server load on server01 has risen to 200+ and the gluster clients are no longer able to access the mounts. Is there a way to do this that is not as impactful? Could I manually rsync the bricks before adding the second node back in? 



The recommended way to heal is using the command mentioned. The gluster self heal daemon takes appropriate file locks before healing. Since clients are accessing the volume, I don't think bypassing that and rsyncing the bricks is a good idea. 

Regards, 
Ravi 



<blockquote>





Alun. 

----- Original Message -----

From: "Ravishankar N" <ravishankar at redhat.com> 
To: "Alun James" <ajames at tibus.com> 
Cc: gluster-users at gluster.org 
Sent: Wednesday, 8 January, 2014 4:00:44 AM 
Subject: Re: [Gluster-users] delete brick / format / add empty brick 


On 01/07/2014 09:40 PM, Alun James wrote: 

<blockquote>

Hi folks, 


I had a 2 node (1 brick each) replica, some network meltdown issues seemed to cause problems with second node (server02). glusterfsd process reaching 200-300% and errors relating to split brain possibilities and self heal errors. 


Original volume info: 


Volume Name: myvol 

Type: Replicate 
Status: Started 
Number of Bricks: 2 
Transport-type: tcp 
Bricks: 
Brick1: server01:/brick1 
Brick2: server02:/brick1 


I removed the second brick (that was showing server problems). 


gluster volume remove-brick myvol replica 1 server02:/brick1 


Now the volume status is: 



Volume Name: tsfsvol0 
Type: Distribute 
Status: Started 
Number of Bricks: 1 
Transport-type: tcp 
Bricks: 
Brick1: server01:/brick1 


All is fine and the data on working server is sound. 


The xfs partition for server02:/brick1 has been formatted and therefore the data gone. All other gluster config data has remained untouched. Can I re-add the second server to the volume with an empty brick and the data will auto replicate over from the working server? 


gluster volume add-brick myvol replica 2 server2:/brick1 ?? 


</blockquote>

Yes this should work fine. You will need to run a `gluster volume heal myvol full` to manually trigger the replication. 


<blockquote>






ALUN JAMES 
Senior Systems Engineer 
Tibus 

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</blockquote>



</blockquote>


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