rsync checksums change randomly

[Kevin Korb]

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If rsync computes a different checksum for the same data I would
suspect that something is corrupting the data occasionally.  If it is
a disk problem then I would expect one side to be seeing IO errors but
without that I would suspect bad RAM on one end.

On 08/28/13 13:29, Tomasz Muras wrote:
> Hello,
> 
> I have a weird issue with rsync randomly marking some files as
> having a different checksum (see sample outputs below - run one
> after another). You would think it is some kind of corruption / io
> problem with the files but it doesn't seem so - I have copied files
> around, changes source to different machines, counted md5s manually
> 100s of times - always the same. All files except config.php are
> the same (the same md5). I have tried with and without
> --checksum-seed option. The same files are always affected
> (randomly listed as changed or not). Do you have any idea how to
> debug it? Would there be a way in rsync to show me checksums it
> calculated on both ends for example?
> 
> The version on source: $ rsync --version rsync  version 3.0.9
> protocol version 30 Copyright (C) 1996-2011 by Andrew Tridgell,
> Wayne Davison, and others. Web site: http://rsync.samba.org/ 
> Capabilities: 64-bit files, 64-bit inums, 64-bit timestamps, 64-bit
> long ints, socketpairs, hardlinks, symlinks, IPv6, batchfiles,
> inplace, append, ACLs, xattrs, iconv, symtimes
> 
> The version on a target: rsync --version rsync  version 3.0.7
> protocol version 30 Copyright (C) 1996-2009 by Andrew Tridgell,
> Wayne Davison, and others. Web site: http://rsync.samba.org/ 
> Capabilities: 64-bit files, 64-bit inums, 64-bit timestamps, 64-bit
> long ints, socketpairs, hardlinks, symlinks, IPv6, batchfiles,
> inplace, append, ACLs, xattrs, iconv, symtimes
> 
> tomasz at tt:/tmp$ rsync -n -i -r -l -c --checksum-seed=1 --delete ./ 
> $SERVER:/storage/vhosts/$DOMAIN/dev/www.NEW | grep -v
> '<f\.\.T\.\.\.\.\.\.' <fcsT...... config.php <fc.T......
> filter/activitynames/filter.php <fc.T......
> filter/activitynames/lang/en/filter_activitynames.php <fc.T......
> filter/algebra/AlgParser.pm <fc.T......
> filter/algebra/algebra2tex.pl <http://algebra2tex.pl> <fc.T......
> filter/algebra/algebradebug.php <fc.T......
> filter/algebra/filter.php <fc.T...... filter/algebra/pix.php 
> <fc.T...... filter/algebra/lang/en/filter_algebra.php <fc.T......
> filter/censor/filter.php <fc.T......
> filter/censor/filtersettings.php
> 
> tomasz at tt:/tmp$ rsync -n -i -r -l -c --checksum-seed=1 --delete ./ 
> $SERVER:/storage/vhosts/$DOMAIN/dev/www.NEW | grep -v
> '<f\.\.T\.\.\.\.\.\.' <fcsT...... config.php
> 
> 
> cheers, Tomek
> 
> 

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	Kevin Korb			Phone:    (407) 252-6853
	Systems Administrator		Internet:
	FutureQuest, Inc.		Kevin at FutureQuest.net  (work)
	Orlando, Florida		kmk at sanitarium.net (personal)
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