Re: Proper command for replace-brick on distribute–replicate?

Ravishankar N <ravishankar@xxxxxxxxxx> · Tue, 11 Jun 2019 22:02:23 +0530



    On 11/06/19 9:11 PM, Alan Orth wrote:

    
        Dear list,
        

        In a recent discussion on this list Ravi suggested that the
          documentation for replace-brick¹ was out of date. For a
          distribute–replicate volume the documentation currently says
          that we need to kill the old brick's PID, create a temporary
          empty directory on the FUSE mount, check the xattrs,
          replace-brick with commit force.
        

        Is all this still necessary? I'm running Gluster 5.6 on
          CentOS 7 with a distribute–replicate volume.

        
    No,  all these very steps are 'codified' into the `replace brick
    commit force` command via
    https://review.gluster.org/#/c/glusterfs/+/10076/ and
    https://review.gluster.org/#/c/glusterfs/+/10448/.  You can see the
    commit messages of these 2 patches for more details.

    
    You can play around with most of these commands in a 1 node setup if
    you want to convince yourself that they work. There is no need to
    form a cluster.

    [root@tuxpad glusterfs]# gluster v create testvol replica 3
      127.0.0.2:/home/ravi/bricks/brick{1..3} force

    [root@tuxpad glusterfs]# gluster v start testvol

    [root@tuxpad glusterfs]# mount -t glusterfs
      127.0.0.2:testvol /mnt/fuse_mnt/

    [root@tuxpad glusterfs]# touch /mnt/fuse_mnt/FILE

    [root@tuxpad glusterfs]# ll /home/ravi/bricks/brick*/FILE

    -rw-r--r--. 2 root root 0 Jun 11 21:55
      /home/ravi/bricks/brick1/FILE

    -rw-r--r--. 2 root root 0 Jun 11 21:55
      /home/ravi/bricks/brick2/FILE

    -rw-r--r--. 2 root root 0 Jun 11 21:55
      /home/ravi/bricks/brick3/FILE

    
    [root@tuxpad glusterfs]# gluster v replace-brick testvol
      127.0.0.2:/home/ravi/bricks/brick3
      127.0.0.2:/home/ravi/bricks/brick3_new commit force

    volume replace-brick: success: replace-brick commit force
      operation successful

    [root@tuxpad glusterfs]# ll
      /home/ravi/bricks/brick3_new/FILE

    
    -rw-r--r--. 2 root root 0 Jun 11 21:55
        /home/ravi/bricks/brick3_new/FILE
    Why don't you send a patch to update the doc for replace-brick? I'd
    be happy to review it. ;-)

    HTH,

    Ravi

    
        Thank you,

        
        ¹ https://docs.gluster.org/en/latest/Administrator
          Guide/Managing Volumes/

          -- 

          Alan Orth

            alan.orth@xxxxxxxxx

            https://picturingjordan.com

            https://englishbulgaria.net

            https://mjanja.ch

            "In heaven all the interesting people are missing."
            ―Friedrich Nietzsche
        
      
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