[squid-users] HTCP cache expiration - how does it work?

Hi all,

I'm new at squid.. I'm trying to setup an environment to handle a very big
load (9 million pageviews a week - approx. 200 million hits a week).

My thought was that I would setup a number of squid-siblings (10-20) -
which would serve all the static pages for all our sites.. The siblings
would refresh their information from 2-3 parent caches - and never from the
origin.. (as they are it seen from a dns-stand point).

My problem however, is that some of our static pages, change quite often..

My idea was to set the expiration time for the squid-siblings with a
refresh_pattern of 99999 min. and override-expire, reload-into-ims and
ignore-reload and
since I control the origin servers, I would be able to update the static
pages when needed, and push the changes to the squid servers.

I know the client program, can contact a squid-server and force it to
refresh an url.. (which would work - but if you have 30 servers that's
perhaps a lot for each page?)

I was thinking of using HTCP between the siblings and parents, so that I
would only have to use the client program to force-refresh on the parents..
and then HTCP would refresh the siblings..

Is that possible? how should you configure squid for this to work?

The requirement for this setup is Instant-refresh (within 20 seconds or
so..) of all squid-siblings.. and here I like the fact that squid waits to
refresh the page, until it actually gets a client-request for it..

I hope you can help me with HTCP and how it works, and wether it's
applicable for this setup.

-------------| This mail has been sent to you by: |------------
Klavs Klavsen, IT-coordinator and Systems Administrator at
Metropol Online - http://www.metropol.dk
Tlf. 33752700, Fax 33752720, Email ktk@metropol.dk

Private- Email klavs@klavsen.net - http://www.vsen.dk

--------------------[ I believe that... ]-----------------------
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Received on Thu Oct 18 2001 - 05:09:37 MDT