how to use --checksum-seed ?

Matt McCutchen matt at
Tue Oct 14 00:27:49 GMT 2008

On Mon, 2008-10-13 at 11:02 -0400, CSights wrote:
> 	I've been trying to use "--checksum-seed" to speed up backups .  I have a 
> homebrew script which creates incremental backups using hardlinks.  To save 
> disk space I turn on --checksum so that when file's mod-times change rsync 
> doesn't create a new file (breaking the hardlinking) unless the contents of 
> the file are different as well.
> 	I tested the command:
> #rsync -aHiy -r --delete --ignore-errors --checksum --checksum-seed=1 fromdir 
> todir
> 	but I couldn't find where the checksums were being cached.  

--checksum-seed sets the seed used in the computation of checksums; it
does not cache checksums.  For that, look into the checksum-reading.diff
or checksum-xattr.diff patches that come with rsync.


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