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Sam,

Shamshad Ansari wrote:
| I have a web application which runs on Tomcat. There will be at any
| given time a maximum of 20 users. So, the traffic is not much.
| However, the application is kind of mission critical and therefore, we
| can not afford any downtime. I am thinking Clustering would be an
| option where if one server goes down, the other picks up.

Is it acceptable for users to have to re-login in the event of a server
failure? If so, you can just set up simply clustering via mod_jk, which
binds a particular session to a single back-end machine. You don't have
to use distributable sessions or worry about sending data around the
cluster so the data is available everywhere just in case a server goes down.

| Could any one please suggest what would be the best option. Also, if
| you could point me to a good tutorial to accomplish this. may be a
| step-by-step example.

You should definitely start here:
http://tomcat.apache.org/tomcat-6.0-doc/cluster-howto.html

There is quite a bit of information in there, including background info
and step-by-step instructions.

- -chris

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