I am developing a JSF web application running on Jetty to handling about 70,000 to 80,000 transactions simultaneously per day. I am headache how to determine the hardwares, how many servers? standalone or VM? CPU, RAM, etc?
Unfortunately not. It depends on whether the transactions are equally spread throughout the day or have "peak" and "off" times, how long it takes that best- and worst-case times to execute the transactions, and other things, including whose webapp server you'll be running.
Obviously that many transactions per day indicates a lot of activity, so you'll almost certainly want a clustered configuration. But how many nodes in the cluster, how powerful each node is, and so forth you'll have to determine. That means you really need to run some basic tests so you'll have a better feel for how things scale.
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