----------------------------------------------------------------------
Message: 1
Date: Fri, 8 Jul 2011 15:54:19 -0700
From: Vikas Gorur<vi...@gluster.com>
Subject: [Gluster-users] GFID mismatches and tools to fix them
To: gluster-users@gluster.org
Cc: gluster-de...@gluster.com
Message-ID:
<cahvddbpm1yarbzmevk6hyn8u9yt-ayetg65i__sfmmnp0nv...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi everyone,
As some of you may know, the presence of files/directories which have
different GFID's on different backends can cause the GlusterFS client to
throw up errors, or even hang. Among others, we've had users of Enomaly
affected by this issue.
A little background on GFIDs:
Each file/directory on a Gluster volume has a unique 128-bit number
associated with it called the GFID. This is true regardless of Gluster
configuration (distribute or distribute/replicate). One inode, one GFID.
The GFID is stored on the backend as the value of the extended attribute
"trusted.gfid". Under normal circumstances, the value of this attribute is
the same on all the backend bricks. However, certain conditions can cause
the value on one or more of the bricks to differ from that on the other
bricks. This causes the GlusterFS client to become confused and throw up
errors. This applies to both the 3.1.5 and 3.2.1 versions of the filesystem,
and previous versions in those series.
In a future bugfix release GlusterFS will fix this issue automatically when
it detects it. Until then, if you encounter this problem, please use the
following set of tools to manually fix it on the backends:
https://github.com/vikasgorur/gfid
The repository contains the tools as well as a README that explains how to
use them.
Your questions and comments are welcome.
Dear Vikas-
Thanks for provding these tools. Unfortunately I think I have found a
problem with the procedure outlined in the README - I don't think it
works for files with names containing the colon character. I still have
a lot of gfid errors in my logs after running the gfid tools on one
volume, and all the filenames have one or more ':' characters. There
are 1677 files still affected with "gfid different" so I don't think it
can be a coincidence.
Regards
-Dan.
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