RE: [htdig] Mirror Sites and Rsync

Subject: RE: [htdig] Mirror Sites and Rsync
From: Brad Handy (
Date: Fri Sep 01 2000 - 10:17:40 PDT

True the point is moot when the people who control the hardware won't
install what you want. However, rsync CAN be set up so that it does copy on
the difference between the files (see the man page on rsync on a system
where it's installed).

Rsync is used at my alma mater. They use it to copy only the differences in
Access Databases from their satellite centers so their files can be backed
up. It works really nice.

But, that's beside the point, since the webhost won't install it.

Bradley M. Handy | Email:
Director of Internet Programming | Phone: (517) 371-7830
Synergy Soup Interactive | (877) 371-7830
831 N. Washington Avenue |
Lansing, MI 48906 |

-----Original Message-----
From: Geoff Hutchison []
Sent: Friday, September 01, 2000 6:49 AM
To: J. op den Brouw
Cc: Brad Handy;
Subject: Re: [htdig] Mirror Sites and Rsync

On Fri, 1 Sep 2000, J. op den Brouw wrote:

> I thought that rsync didn't use much bandwidth? AFAIK, rsync (as CVS no
> doubt) only copies updated pages, and only that part that is updated
> (I mean, not the whole file).

I may be wrong, but I don't believe rsync actually copies diffs. I think
it copies the whole changed file. I also believe there's less chatter. But
the whole point is a bit moot if the IT people only want to allow one. ;-)

> BTW: it would be a nice discussion on how to set up mirrors world wide
> for ht://dig. Eventually, we do it to relief the main ht://dig site....

Yes, I'll set up a "mirroring" page with the instructions I just sent.

> I will write a howto on how-to (!) mirror de FTP site using mirror 2.9.
> I use it now in a testing period and ony on sunday's, as a new snapshot
> comes out, it will pull in files...

Actually, I use wget here, but it's probably the same. In the case of the
FTP site (which is the same as /files on the website), almost everything
is binary, so it doesn't matter much how you update.

-Geoff Hutchison
Williams Students Online

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