rsync - Oct 2008 - how to use --checksum-seed ?

Hi,
	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.  

	How does one use --checksum-seed ?

Thanks!
	C.

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.

Matt

Thanks Matt,
	You are most helpful.

C.