hi, Replicate only keeps track of the fact that an operation is performed successfully on one brick while on the other brick it was not successful. It does not know the actual change. So you can endup where both the files are same but there is xattr-split-brain. Example: touch f bring brick-0 down echo 'a' > f brick brick-0 up, bring brick-1 down (assume self-heal on this file was not trggered on this file) echo 'a' > f Bring brick-1 up. Now the file 'f' is in xattr split-brain, even though both of the files contain same data. Pranith. ----- Original Message ----- From: "Emmanuel Dreyfus" <manu@xxxxxxxxxx> To: "Pranith Kumar Karampuri" <pkarampu@xxxxxxxxxx> Cc: gluster-devel@xxxxxxxxxx Sent: Wednesday, June 20, 2012 5:03:36 PM Subject: Re: split brain: how should it be cured? On Wed, Jun 20, 2012 at 05:35:36AM -0400, Pranith Kumar Karampuri wrote: > Procedure to reset split-brain is to remove one of the files. > 3.3 release onwards we need to also delete the file from gfid-backend. > if the file is a.txt with gfid 5c71a049-a424-480e-9e69-2cdfd7a0a7a0 > remove the file a.txt > remove the file <brick-path>/.glusterfs/5c/71/5c71a049-a424-480e-9e69-2cdfd7a0a7a0 > the gfid path is a hardlink to a.txt glusterfs 3.3 behavior is really odd. It was possible to read the offending file, and after a while, it started returning EIO again. Removing the file and its gfid hardlink seems to workaround the problem, though. But I still do not understand how they are considered in metadata split brain: all metadata were the same: On brick1: File: "/export/wd3a/manu/netbsd/usr/src/tools/mktemp/Makefile" Size: 165 FileType: Regular File Mode: (0644/-rw-r--r--) Uid: ( 500/ manu) Gid: ( 500/ manu) Device: 0,16 Inode: 55748693 Links: 2 Access: Wed Jun 20 13:24:31 2012 Modify: Sun Dec 8 21:20:03 2002 Change: Wed Jun 20 11:31:28 2012 trusted.afr.pfs-client-0 00 00 00 00 00 00 00 00 00 00 00 00 trusted.afr.pfs-client-1 00 00 00 00 00 00 00 01 00 00 00 00 On brick2: File: "/export/wd3a/manu/netbsd/usr/src/tools/mktemp/Makefile" Size: 165 FileType: Regular File Mode: (0644/-rw-r--r--) Uid: ( 500/ manu) Gid: ( 500/ manu) Device: 0,24 Inode: 25441937 Links: 2 Access: Wed Jun 20 13:24:31 2012 Modify: Sun Dec 8 21:20:03 2002 Change: Wed Jun 20 11:31:28 2012 trusted.afr.pfs-client-0 00 00 00 00 00 00 00 03 00 00 00 00 trusted.afr.pfs-client-1 00 00 00 00 00 00 00 00 00 00 00 00 -- Emmanuel Dreyfus manu@xxxxxxxxxx _______________________________________________ Gluster-devel mailing list Gluster-devel@xxxxxxxxxx https://lists.nongnu.org/mailman/listinfo/gluster-devel
