nate wrote: > > Clustering is a really complex thing to get right, it can often > cause more problems than it would otherwise prevent. Even some > high end clustering is really poor. A couple of jobs ago I had > to use BEA Weblogic application clustering for a massive J2EE > app. Ran us roughly $10 or was it $20k per CPU. We had major, > major outages with that thing. Most of the time we(and BEA) > were able to trace it to the weblogic cluster itself. > > So think long and hard about what your trying to accomplish, > and if there is another way to get there without relying on > clustering. When I say clustering I mean pretty tight integration > between the systems in the cluster, where if one box can go > whacky it can take the rest of the cluster with it. Depends on what you are doing, of course, but you can scale a typical web site (lots of viewers of the same content, not too much session-specific data or database writes) by replicating the file content across a bunch of servers and using memcache in front of your database. -- Les Mikesell lesmikesell at gmail.com