Re: about split-brain

Ravishankar N <ravishankar@xxxxxxxxxx> · Fri, 08 Aug 2014 12:00:02 +0530



    On 08/08/2014 11:54 AM, hwh@xxxxxxxxxxx
      wrote:

    
      Is glusterfs bug ?  i want to know whether have some way to avoid this split-brain?
    
    Please explore client quorum and server quorum options in gluster.

    #gluster volume set help|grep quorum

    
            hwh@xxxxxxxxxxx
          
        
            From: Roman
            Date: 2014-08-08 14:16
            To: hwh@xxxxxxxxxxx
            CC: gluster-users
            Subject: Re: Re:  about
              split-brain
          
        
            So try your tests again, but wait for
              synchronization first. You can check the state of files on
              servers with getfattr -d -m. -e hex
              /path-to-file-on-gluster-server
              both should return 0x000000000000000000000000
            
            
              2014-08-08 9:11 GMT+03:00 hwh@xxxxxxxxxxx
                <hwh@xxxxxxxxxxx>:

                
                    Yes, I do not wait for synchronization
                        to complete.
                    

                          hwh@xxxxxxxxxxx
                        
                      
                          From: Roman
                          Date: 2014-08-08 13:53
                          To: hwh@xxxxxxxxxxx
                          CC: gluster-users
                          Subject: Re:  about
                            split-brain
                        
                      
                              Hello,
                                

                                Did you wait for synchronization to
                                  complete before plugging second server
                                  off? Usually it need 10-15 minutes.
                                  Sometimes faster.
                              
                              
                                  2014-08-08 5:19 GMT+03:00 hwh@xxxxxxxxxxx
                                  <hwh@xxxxxxxxxxx>:

                                  
                                      hi:
                                      

                                      I have a problem about
                                        split-brain, details
                                          as below:
                                      

                                      PC1 and PC2 is AFR, stored a
                                        file 1.txt
                                      

                                      1. write "123" to 1.txt, then
                                        1.txt in pc1 is same with 1.txt
                                        in PC2, content is "123"
                                      

                                      2. PC1  network disconnect,
                                        write "45" to 1.txt, then  content
                                          of 1.txt
                                          in pc1 is "123",  
                                        
                                       
                                           content
                                          of 1.txt
                                          in pc2 is "12345"
                                      

                                      3. PC2
                                           network disconnect, but PC1
                                          network is good, write
                                          "67" to 1.txt, then  content
                                          of 1.txt
                                          in pc1 is "12367",  
                                        
                                       
                                           content
                                          of 1.txt
                                          in pc1 is "12345"
                                      

                                      4. so split brain occur
                                      

                                      how glusterfs avoid this?
                                        Have some ways to solve? this is
                                        my questions. thank you
                                      

                                                hwh@xxxxxxxxxxx
                                              
                                            
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                                -- 

                                Best regards,

                                Roman.
                              
                            
              -- 

              Best regards,

              Roman.
            
          
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