What the limits number of sites on a server

CPU usage, server space or bandwidth

[caran1]

What limits number of sites you can have on a server or VPS. Is it the server space, CPU usage or bandwidth?
Currently I am using a very small percentage of my allotted space and bandwidth, does adding more sites load the CPU and affect the vPS performance.Also if your website only has HTML pages,by what factor is the usage of the CPU resources less, compared to dynamic/database driven website.
Thanks in advance

[drhowarddrfine]

Your bandwidth has the biggest affect on how much you can serve. Probably memory is the second limiting factor followed by disk space. Memory size would affect speed of serving pages. CPU is the least problem from what I've read and what I've seen. I had some very busy sites running on a Pentium II with no problems but I was running FreeBSd and Apache so I don't know how well a MS product would do.

If you take the size of a typical page and multiply it by the number of hits, you will get an idea of the bandwidth you need.

[mattglet]

If you take the size of a typical page and multiply it by the number of hits, you will get an idea of the bandwidth you need.

Not entirely true. You need to multiply the number of PAGE VIEWS by the average page size to get a ballpark figure.

There are a number of things that will determine resource usage, but here are 2 very general scenarios:
- If you're using static HTML pages, then your primary concerns will be 1. bandwidth, 2. CPU, 3. RAM
- If you're using a database, you'll see highest usage in 1. bandwidth, 2. RAM, 3. CPU