On Mon, 17 Dec 2007, Kenneth Porter wrote:
On Monday, December 17, 2007 7:05 PM -0800 Robert Arkiletian
<robark@xxxxxxxxx> wrote:
Also don't forget that many mirrors offer rsync. If you rename your
5.0 DVD to the 5.1 version and do an rsync it will save lots of
bandwidth.
That surprises me. Won't similar RPM's in the two images likely be at
different offsets in the iso? Can rsync deal with that? I didn't realize it
could handle shifted differences.
Rsync has no concept of the contents of files within an iso. It only knows
about blocks of data. Rsync is real good at fixing/updating iso's. It will only
transfer the blocks of data that have changed. Typically you get a large bandwidth
savings when using a previous iso as a seed. Just make sure you get the name correct
AND you do not abort the download midstream. If you abort the download midstream
rsync will delete your seed iso and leave you with whatever it has succeeded in
downloading and running a checksum against.
If you are really curious about all of this magic have a look here:
http://rsync.samba.org/how-rsync-works.html
Most people do not realize just how cool rsync is.
Hope this helps.
Regards,
--
Tom Diehl tdiehl@xxxxxxxxxxxx Spamtrap address mtd123@xxxxxxxxxxxx
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