We have a nice hardware and software setup we came up with after a lot of testing with a legal tube-like site pushing 400 Mbps (120,000 GB / month). By choosing the RIGHT configuration, we kept it simple and not too costly.
Whereever you host, whether with us or more likely somewhere else, we can consult with you on what you actually need so that the server you get fits your needs without going way overboard.
Once you get beyond the basic "typical" server, it's VERY common to go way overboard on some components and not do enough on others. For example, your bottleneck will be IO throughout. Your CPUs should see little load. So you want to spend your money on drives and network cards, NOT on CPUs.
Similarly, we see people set up complicated, error prone clusters of three servers with one or two drives each. Putting those same six drives together in the same chassis will give higher performance, lower cost, and a far fewer problems. When you're talking about performance (not HA), the extra problems a cluster brings are appropriate when you outgrow our 16 drive, two quad core CPU, 32 GB RAM server.
(Clustering for HA is an entirely different topic., with a different type of configuration for different reasons than a cluster for scalability.)
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