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Our development team has 14 small applications deployed to Tomcat 5.5 currently (moving to 6.0 shortly). I say small because the number of users for each app is low. I’m wondering what performance metrics and indicators I should be looking at to decide when it is time to introduce an additional application server.
Aside from memory usage and CPU utilization, what should I look out for? How do I know when it’s time to scale up or out?
I would be monitoring:
iostat(or whatever counterpart on Windows if you’re running Win)Generally it is hard to advise when to scale up/out, each situation is different. But it is always worth to have a plan – in case if your customer base will double in the next few months.
Scaling up is usually cheaper (to a point). I recommend this site for scalability-related stuff.