How can I automatically power off a server at 20.00pm and turn It On again at 8.00am in the morning? Is there any sw or hw tool that makò me able to schedule On/Off time?
The server could be anything Linux/Mac Os X/Windows.
If the NIC and BIOS in your server support it, you should be able to enable Wake-on-LAN, then set another machine to send the magic packet at wake time. Though you might save more in the long run by buying processors (and switches) with "green" features that allow them to consume less power when not heavily used (the unused cores/ports stop drawing power, if I remember right).
I had a Dell poweredge that could do this... It never worked right.
If you don't mind a bit (ok so by a bit I mean a lot) of tomfoolery here is an idea or three.
Do this at your own risk
Yeah, yeah there are tons of reasons not to do it this way. But it would work, for cheap.
So could you do the same thing only less hokey? Sure.
You are going to need a micro controller, some relays and a small power supply.
Don't want to open up that case? Have another server?
Hey look this guy did something similar. ;)
Good luck with your tomfoolery!
You can't do this without support outside the OS. The OS can't turn the computer on when the computer is off. It might be able to bring it out of sleep or something close to sleep mode, but that's about it, and I haven't heard of an OS that wakes itself up on schedule.
Some BIOSes support this. You can try to find one that does. I seem to recall that some Dells do.
Some PDUs (Power Distribution Units... think very fancy network enabled power strip) support remote control of individual outlets; those are options also, but expensive.
Hope that helps.