How are servers running continuously?

Question

Iron

I'm interested in the question of how servers are serviced in large companies, i.e. clean, diagnose malfunctions, etc. Take google for example, how do they keep their servers running non-stop, how do they maintain them, clean them, upgrade or optimize them, etc. without turning them off the network?

Answer 1

Shutdown and service.
Like all servers.
What is the problem with shutting down the server?
These services should work without stopping, and the servers are quietly turned off when necessary.

Answer 2

Read, for example, about 15 minutes on the topic "server cluster".
Knowledge and specific answers will not give, only some idea.
And so - everything from the situation. If there is a certain website, then we make a copy on another server and redirect users there. Meanwhile, on the main - service. This is a very primitive description, now only small offices do this.

Answer 3

Inside Google, their analogue of GAE, they can turn off 10-30% of servers and no one will notice anything.
Other large companies also spread the service over several servers so that any of them can be turned off.

Answer 4

in small companies they assemble a duplicate server with system cloning and simply plug the cable later