Cheap Server Machine

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What is it with server hardware that actually makes it more suited for server hosting vs. say a collection of cheap PCs or a good PC?

When hosting a lot of servers, holding them up, getting power to them, being able to get to them all makes a difference. The typical way to do that is in a rack and servers are shaped so they fit in standard rack sizes and come with rails and cable tidies which all fit the right spacings Lego style. If you build your own machines, you will have to deal with putting them on the floor or standing them on shelves, running cables to them neatly, a way to keep them behind a locked door or to lock the front of them to prevent fiddling, etc.

On the electronics side, servers are built with more expensive memory which can correct errors (Google's study on their own kit showed error rates of >3, 500 errors per memory stick per year). Not much good having a database spread over cheap machines if it's content gets quietly corrupted and it was important.

They are built with higher quality disks which can run 24x7 and stay in warranty, run at faster speeds (15, 000 RPM compared to standard 7, 200 RPM), connect to faster interfaces (Serial Attached SCSI), and they often have high end disk controllers which handle spreading load over disks in a way that works even if a disk fails, and have on board memory for buffering disk access to make it faster.

Electrically, they are more carefully designed so they can have disks removed and reconnected while switched on - and in bigger servers, have component cards and processors, power supplies and expansion cards added and removed while on.

They usually use more expensive processors such as Intel Xeons which have more integrated memory and faster processor-to-memory interface ability, more cores and beefier cooling.

Often they have simply more of everything - a dozen memory sockets, half a dozen disk slots, multiple processors, multiple power supplies, four network connections, all for handling more work at the same time, or handling a single failure.

All their electronic components such as capacitors and resistors, will have higher quality material so they can stand being run at full load for longer in a hot environment, and not fail. They aren't competing on being cheap, they are competing on being trusted to work for a long time.

Airflow will matter - inside they have carefully laid out components and cabling, and many fans. It's not uncommon to see two rows of fans one blowing through the other to shift more air and tolerate fan failure.

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