[Gluster-users] Detecting split brain

[anthony garnier]

thank you for  your answer.
A last question for you, on some directory I got a little difference when I display extended attribute : 

getfattr -d -m "trusted*" -e hex *

Server1 # file: yvask300
trusted.gfid=0x433c796513864672871226072825336f
trusted.glusterfs.dht=0x00000001000000007fffffffffffffff

Server2 # file: yvask300
trusted.gfid=0x433c796513864672871226072825336f
trusted.glusterfs.dht=0x00000001000000007fffffffffffffff


Server3 # file: yvask300
trusted.afr.poolsave-client-2=0x000000000000000002000000
trusted.afr.poolsave-client-3=0x000000000000000002000000
trusted.gfid=0x433c796513864672871226072825336f
trusted.glusterfs.dht=0x0000000100000000000000007ffffffe

Server4 # # file: yvask300
trusted.afr.poolsave-client-2=0x000000000000000002000000
trusted.afr.poolsave-client-3=0x000000000000000002000000
trusted.gfid=0x433c796513864672871226072825336f
trusted.glusterfs.dht=0x0000000100000000000000007ffffffe

why  the attribute "trusted.afr.VOLNAME-client-X" is not displayed on Server 1 & 2 ?


Thx for your help.

Date: Fri, 2 Dec 2011 08:59:48 +0530
From: pranithk at gluster.com
To: sokar6012 at hotmail.com
CC: jdarcy at redhat.com; gluster-users at gluster.org
Subject: Re: [Gluster-users] Detecting split brain


  


    
  
  
    On 12/01/2011 11:33 PM, anthony garnier wrote:
    
      
      
      
        So if I understand well, a value different than
        0sAAAAAAAAAAAAAAAA for the attribute
        trusted.afr.poolsave-client-0 indicate split brain.

        

        Thx

        

        > Date: Thu, 1 Dec 2011 11:23:29 -0500

          > From: jdarcy at redhat.com

          > To: sokar6012 at hotmail.com

          > CC: gluster-users at gluster.org

          > Subject: Re: [Gluster-users] Detecting split brain

          > 

          > On Thu, 1 Dec 2011 16:00:09 +0000

          > anthony garnier <sokar6012 at hotmail.com> wrote:

          > 

          > > 

          > > Hi,

          > > 

          > > I got a lot of files with attributes :
          0sAAAAAAAAAAAAAAAAA

          > > 

          > > Serv 1 :

          > > # file: tbo_rmr_globale_log_11-04-07_15h43m48s.log

          > > trusted.afr.poolsave-client-0=0sAAAAAAAAAAAAAAAA

          > > trusted.afr.poolsave-client-1=0sAAAAAAAAAAAAAAAA

          > > trusted.gfid=0sfm7CRROuQ4+wuQfmHjFCdg==

          > > 

          > > Serv 2 :

          > > # file: tbo_rmr_globale_log_11-04-07_15h43m48s.log

          > > trusted.afr.poolsave-client-0=0sAAAAAAAAAAAAAAAA

          > > trusted.afr.poolsave-client-1=0sAAAAAAAAAAAAAAAA

          > > trusted.gfid=0sfm7CRROuQ4+wuQfmHjFCdg==

          > > 

          > > Does it mean that those files need Self-Healing ? I
          use GlusterFS

          > > 3.2.3

          > 

          > This is actually normal. For some reason that would
          probably make me

          > throw up if I knew it, getfattr misreports
          0x000000000000000000000000

          > as 0sAAAAAAAAAAAAAAAA (which would be
          0x404040404040404040404040) if

          > you don't give it the "-e hex" flag. The value is
          actually three

          > four-byte integers, and if they're zero it means there
          are no pending

          > operations. Any *other* value is likely to indicate split
          brain.

        
      
      

      
      

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    Small Correction:

    Different value than 0sAAA.. means there are pending operations.

    If you dump the values with -e hex option and there should be 24
    digits, first 8 represent pending operations on the data of the
    files (write/truncate). next 8 represent pending operations on
    metadata (permissions, ownership etc) next 8 represent pending
    operations on entry (creation/deletion/rename of a file inside that
    directory). Now if both data/metadata/entry digits are non-zero on a
    file then that will be split-brain.

    Example:

    Data split-brain:

     trusted.afr.poolsave-client-0=0s000000010000000000000000

     trusted.afr.poolsave-client-1=0s000000200000000000000000

    

    Thanks

    Pranith
 		 	   		  
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