Re: Gluster does not seem to detect a split-brain situation

Юрий Полторацкий <y.poltoratskiy@xxxxxxxxx> · Sun, 07 Jun 2015 21:38:55 +0300



    Hi,

    
    First, I do not think that you have a split-brain.  I have a
    split-brain and my `gluster volume heal info` is:

    gluster> volume heal vol3 info 

    Brick node5.virt.local:/storage/brick12/

    /5d0bb2f3-f903-4349-b6a5-25b549affe5f/dom_md/ids - Is in
      split-brain

    
    Number of entries: 1

    
    Brick node6.virt.local:/storage/brick13/

    /5d0bb2f3-f903-4349-b6a5-25b549affe5f/dom_md/ids - Is in
      split-brain

    
    Number of entries: 1

    
    Second, you would setup a quorum. Some info you can sea here.
    My config is (two server with replica 2):

    cluster.server-quorum-type: server

    cluster.quorum-type: fixed

    cluster.quorum-count: 1

    cluster.server-quorum-ratio: 51%

    
    And the last, I am a new in Gluster, so can be wrong.

    
    07.06.2015 20:13, Sjors Gielen пишет:

    
      Hi all,
        

        I work at a small, 8-person company that uses Gluster for
          its primary data storage. We have a volume called "data" that
          is replicated over two servers (details below). This worked
          perfectly for over a year, but lately we've been noticing some
          mismatches between the two bricks, so it seems there has been
          some split-brain situation that is not being detected or
          resolved. I have two questions about this:
        

        1) I expected Gluster to (eventually) detect a situation
          like this; why doesn't it?
        2) How do I fix this situation? I've tried an explicit
          'heal', but that didn't seem to change anything.
        

        Thanks a lot for your help!
        Sjors
        

        ------8<------
        

        Volume & peer info: http://pastebin.com/PN7tRXdU
        curacao# md5sum /export/sdb1/data/Case/21000355/studies.dat
        7bc2daec6be953ffae920d81fe6fa25c
        /export/sdb1/data/Case/21000355/studies.dat

        
        bonaire# md5sum /export/sdb1/data/Case/21000355/studies.dat
        28c950a1e2a5f33c53a725bf8cd72681
          /export/sdb1/data/Case/21000355/studies.dat

        
        # mallorca is one of the clients
        mallorca# md5sum /data/Case/21000355/studies.dat
        7bc2daec6be953ffae920d81fe6fa25c 
          /data/Case/21000355/studies.dat
        

        I expected an input/output error after reading this file,
          because of the split-brain situation, but got none. There are
          no entries in the GlusterFS logs of either bonaire or curacao.
        

        bonaire# gluster volume heal data full
        Launching heal operation to perform full self heal on
          volume data has been successful
        Use heal info commands to check status
        bonaire# gluster volume heal data info
        Brick bonaire:/export/sdb1/data/
        Number of entries: 0

        
        Brick curacao:/export/sdb1/data/
        Number of entries: 0
        

        (Same output on curacao, and hours after this, the md5sums
          on both bricks still differ.)
        

        curacao# gluster --version
        glusterfs 3.6.2 built on Mar  2 2015 14:05:34
        Repository revision: git://git.gluster.com/glusterfs.git
        (Same version on Bonaire)
      
      
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