Re: Microsoft CARP

From: Henrik Nordstrom <>
Date: Sun, 12 Oct 1997 23:33:27 +0200

Here are my 2 cents of thought on CARP vs IPC...

Well, yes CARP is probably better in the situation that Microsoft is
thinking about: A cache ARRAY (that is a large number of machines,
acting as a single cache server, all in the microsoft filofosy that the
more machines the better).

ICP is designed with a cache-hierarchy in mind, and assumes that at any
given single point in the hierarchy only one or max two ICP servers is
needed (two only to provide fault tolerance).

So, yes. If you are thinking about building a LARGE cache array (many
machines acting as a single point cache, not a hierarchy) then
hash-based routing is probably preferable.

If building a hierarchy, with WAN links between the caches, then cache
redundancy is actually preferred, since the WAN links are part of the
bottleneck. It does not matter that the same pages are stored on 20
different servers, since these servers serves 20 different groups of

Henrik Nordström
Paul Chinen wrote:
> I just reed the Cache Array Routing Protocol (
> ) and they say
> that CARP is better than ICP because:
Received on Sun Oct 12 1997 - 15:09:50 MDT

This archive was generated by hypermail pre-2.1.9 : Tue Dec 09 2003 - 16:37:16 MST