On Mon, 4 Aug 2003 12:55, AndyWu wrote:
> Here's how it works in my 2 computers.
>
> First, on auk2
> # rsync -a auk1::pub/linux.iso .
> It takes about 4 minutes. Everything is fine.
>
> However, after doing this on auk1,
> # echo "hello" >> /pub/linux.iso
>
> Then, on auk2
> # rsync -a auk1::pub/linux.iso .
>
> The execution time of the first command is still 4 minutes.
> I think it's supposed to be much shorter than the first case?
> The same results appear in local rsync, too.
> Is there anything wrong with my commands?
>
Andy,
I'm no expert on the use of this excellent program, but there is some
overhead incurred when the client initiates a transfer. Checksums have to be
calculated and sent to the server before any transfer starts. FWIW I
corrected a ~700meg iso in Australia from a server in Germany in about 6
minutes. The iso had been created by ftp download using inumerable resumes on
a dialup link. Fairly obviously there was not a lot wrong with this iso,
which is what would be expected.
This link explains the checksum procedure in depth:
http://rsync.samba.org/tech_report/
HTH
Bob Parker
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