Space and bandwidth is usually never an issue. You should worry more about CPU usage & RAM. If you want to put 500-1000 sites you should have atleast 2GB RAM and I would suggest SCSI drives for faster speeds. Because these are just small business sites, I am assuming that there won't be much PHP & MySQL used along with very few visitors.
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ARIN Requires the justification, I don't think your datacenter could care a less..
My primary web server is a dual xeon, holds about 350~ Websites, Almost 2000 MySQL Databases, and runs two game servers, with minimal load on it.
Bandwidth has become an issue for me (Only 2TB/mo)
But that's another issue entirely
Originally posted by vphost I don't believe it matters on how many sites you run, but matters on what the sites usage are.
If your site utilize high load script/programs then it would probably effect the entire server.
Just thought I should input that.
Bingo! One site could take up all the power if it really wanted to. You cant rates servers by how many accounts it can hold or how much it can serve. Youll have to rate it as you go along probably
Generally robust systems can hold a lot more, but any system that has higher specs is going to have more leverage anyway