[Gluster-users] about split-brain

[Ravishankar N]

On 08/08/2014 11:54 AM, hwh at sangfor.com 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 at sangfor.com
>
>     *From:* Roman <mailto:romeo.r at gmail.com>
>     *Date:* 2014-08-08 14:16
>     *To:* hwh at sangfor.com <mailto:hwh at sangfor.com>
>     *CC:* gluster-users <mailto:gluster-users at gluster.org>
>     *Subject:* Re: Re: [Gluster-users] 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 at sangfor.com <mailto:hwh at sangfor.com>
>     <hwh at sangfor.com <mailto:hwh at sangfor.com>>:
>
>         Yes, I do not wait for synchronization to complete.
>
>         ------------------------------------------------------------------------
>         hwh at sangfor.com <mailto:hwh at sangfor.com>
>
>             *From:* Roman <mailto:romeo.r at gmail.com>
>             *Date:* 2014-08-08 13:53
>             *To:* hwh at sangfor.com <mailto:hwh at sangfor.com>
>             *CC:* gluster-users <mailto:gluster-users at gluster.org>
>             *Subject:* Re: [Gluster-users] 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 at sangfor.com
>             <mailto:hwh at sangfor.com> <hwh at sangfor.com
>             <mailto:hwh at sangfor.com>>:
>
>                 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 at sangfor.com <mailto:hwh at sangfor.com>
>
>                 _______________________________________________
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>                 <mailto:Gluster-users at gluster.org>
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>
>
>
>
>             -- 
>             Best regards,
>             Roman.
>
>
>
>
>     -- 
>     Best regards,
>     Roman.
>
>
>
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