[Gluster-users] Different file in two bricks, no split-brain detected
Chaloulos, Klearchos (Nokia - GR/Athens)
klearchos.chaloulos at nokia.com
Mon Feb 1 08:39:23 UTC 2016
Sorry for not replying, but lately the issue cannot be reproduced. If we have any new occurrences I’ll collect the logs and send them here.
From: EXT Krutika Dhananjay [mailto:kdhananj at redhat.com]
Sent: Wednesday, January 27, 2016 7:12 AM
To: Chaloulos, Klearchos (Nokia - GR/Athens) <klearchos.chaloulos at nokia.com>
Cc: gluster-users at gluster.org
Subject: Re: [Gluster-users] Different file in two bricks, no split-brain detected
Could you share the following pieces of information:
1) output of `gluster volume info <VOL>`
2) the client/mount logs
3) glustershd logs
From: "Klearchos Chaloulos (Nokia - GR/Athens)" <klearchos.chaloulos at nokia.com<mailto:klearchos.chaloulos at nokia.com>>
To: gluster-users at gluster.org<mailto:gluster-users at gluster.org>
Sent: Tuesday, January 26, 2016 9:57:38 PM
Subject: [Gluster-users] Different file in two bricks, no split-brain detected
Description of problem:
My setup has 5 gluster volumes, and each of them has 2 bricks as backend.
When I copy a large file (100MB) in a gluster volume, 9/10 times it works OK. But about 1 in 10 times the resulting md5 is wrong. After checking I found that the file in one brick has the correct md5sum, while the file in the other brick has a wrong md5sum. The size of the two files is the same.
By running "cmp -l <correct_file> <wrong_file>"
I found that the difference was in 49 bytes. So the files in the two bricks had the same size, but 49 files were different. Interestingly enough I saw the same number of 49 bytes being different at every check that I made.
Do you know what might cause this behavior, has anyone seen something like this before? Is this a bug in glusterfs?
Version-Release number of selected component (if applicable):
glusterfs 3.7.5 built on Nov 19 2015 16:29:59
Repository revision: git://git.gluster.com/glusterfs.git
Copyright (c) 2006-2011 Gluster Inc. <http://www.gluster.com>
GlusterFS comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of GlusterFS under the terms of the GNU General Public License.
Not easy to reproduce, about 1 in 10 times in some environments, not reproducible at all in other environments.
Steps to Reproduce:
1. scp <100MB file> <path in gluster volume>
1. md5sum of destination should be the same as the source
2. If checksum of files is different between the two bricks, the command "gluster volume heal <vol-name> info split-brain" should return that the two bricks are in split-brain.
1. 1 in 10 times the destination file has incorrect checksum. Size is the same, but 49 bytes are altered.
2. "gluster volume heal <vol-name> info split-brain" does not return that the bricks are in split-brain, even though the checksum of the file in the two bricks is different. The size of the file is the same in the two bricks. But 49 bytes are altered.
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