I can't say that from experience either -- its just a conservative estimate knowing that 1) my boxes are small, commodity servers 2) I expect my clients to be getting some decent traffic
A lot of the stuff I've worked on is more along the lines of intranet applications -- so the traffic is low, but the complexity high. Or even outside of an intranet that can occur -- a good example might be a CMS that publishes static content. I might want each client to have their own separate instance of the CMS (manageable with MakeAppWorkDir, version control, and other tools). There the performance requirements can be really low -- some instances may be entirely dormant for weeks at a time.
At least, that's the usage scenario I could imagine where you'd have 50 instances.
3) I would rather underestimate and overdeliver than die when
the first publicity event hits.
4) the enlightened elite who want to run webware have enough experience
to recognize that "low-price" is not equivalent to "low-cost",
so paying $20+/mo for quality hosting is not going to throw them
for a loop.
And separate instances give built-in clustering potential ;)
I don't see much of a win for clustering unless you are dealing with a cluster of physical machines. In that scenario, memory and CPU resource issues take a back seat to the complexity of managing the cluster.
Hmmm... I said that wrong. It's not clustering potential I'm thinking of, more clustering avoidance, which you obviously can appreciate. That's one advantage to having out-of-process data stores (i.e., client/server RDBMS), and any other services you can separate across process boundaries can probably be moved to other machines.
Ian
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