[Gluster-users] Does replace-brick migrate data?

[Ravishankar N]

On 23/05/19 2:40 AM, Alan Orth wrote:
> Dear list,
>
> I seem to have gotten into a tricky situation. Today I brought up a 
> shiny new server with new disk arrays and attempted to replace one 
> brick of a replica 2 distribute/replicate volume on an older server 
> using the `replace-brick` command:
>
> # gluster volume replace-brick homes wingu0:/mnt/gluster/homes 
> wingu06:/data/glusterfs/sdb/homes commit force
>
> The command was successful and I see the new brick in the output of 
> `gluster volume info`. The problem is that Gluster doesn't seem to be 
> migrating the data,

`replace-brick` definitely must heal (not migrate) the data. In your 
case, data must have been healed from Brick-4 to the replaced Brick-3. 
Are there any errors in the self-heal daemon logs of Brick-4's node? 
Does Brick-4 have pending AFR xattrs blaming Brick-3? The doc is a bit 
out of date. replace-brick command internally does all the setfattr 
steps that are mentioned in the doc.

-Ravi


> and now the original brick that I replaced is no longer part of the 
> volume (and a few terabytes of data are just sitting on the old brick):
>
> # gluster volume info homes | grep -E "Brick[0-9]:"
> Brick1: wingu4:/mnt/gluster/homes
> Brick2: wingu3:/mnt/gluster/homes
> Brick3: wingu06:/data/glusterfs/sdb/homes
> Brick4: wingu05:/data/glusterfs/sdb/homes
> Brick5: wingu05:/data/glusterfs/sdc/homes
> Brick6: wingu06:/data/glusterfs/sdc/homes
>
> I see the Gluster docs have a more complicated procedure for replacing 
> bricks that involves getfattr/setfattr¹. How can I tell Gluster about 
> the old brick? I see that I have a backup of the old volfile thanks to 
> yum's rpmsave function if that helps.
>
> We are using Gluster 5.6 on CentOS 7. Thank you for any advice you can 
> give.
>
> ¹ 
> https://docs.gluster.org/en/latest/Administrator%20Guide/Managing%20Volumes/#replace-faulty-brick
>
> -- 
> Alan Orth
> alan.orth at gmail.com <mailto:alan.orth at gmail.com>
> https://picturingjordan.com
> https://englishbulgaria.net
> https://mjanja.ch
> "In heaven all the interesting people are missing." ―Friedrich Nietzsche
>
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