Why do internet/ online servers need maintenance ?
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An interenet server is no different than any other computer.
Parts fail, and software upgrades are needed.
With a professional server, you swap our hard drives or power supplies while the system is on, but replacing other parts may require it to be turned off.
You also have security updates and such that require taking the server offline. Those problems are easily solved, if you have multiple servers. Taking one offline when others are up shouldn’t have an impact.
But once huge issue can often be database maintenance. If you need to make changes to that, you don’t want people writing new data during the transition. Its just going to cause issues. So something like that could require the entire site to be taken offline while the updates are made.
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