Automatic Restart after power outage?

ok basically i have 3 servers running

a mail server

a phone server

and a DNS/File server

basically when and if the client has a power outage i obviously will have a UPS for shutting down purposes and to give it time.. but what about when the power comes back on. I will not be onsite and the computers need to restart automatically aka when power comes back on i want the machines to automatically boot back up?

how do i do that or set that up.. do i need certain type of UPS?

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This can be configured in the BIOS. Look out for items like
 "AC Power Loss Restart",
 "PWRON After PWR-Fail",
 "Restore on AC Power Loss",
which depends on which BIOS the machine is using. This item is normally located in the Power Management Menu.

And no, you do not need a special UPS.

Here are some images


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Are you talking about when the UPS shuts off the server hardware itself, then shuts itself off?  The BIOS settings in this case won't help you, since the server's won't be "accidentally" shut off.

You'll need to setup the UPS management software to power the server back on after power is re-applied.  Most Tripp-Lite, APC, and Liebert systems do this.  You just need to make sure you're getting a UPS that's probably 1000VA or more for each server and has a USB mgmt port that will plug into each one.

It's very straightforward to setup, and each vendor has instructions to explain the process as well.
Gary CaseRetiredCommented:
You need a UPS unit that will (a) turn itself off after the PC has been shut down; and (b) automatically power back on when power is restored.     APC, Belkin (no longer in the UPS business but many of their units are still available), CyberPower, etc. all do this  ==> be sure you buy a unit with AVR (any of their better units).

Given a good UPS, you then simply need to configure the PC to "Always On" for the action when power is applied.    As noted above, this is generally an option in the BIOS (although not shown in the screen above).    The choices are usually "Stay Off",  "Previous State",  or "Always On"  or some similarly worded choices.    You want the "Always On" choice -- so whenever power is applied to the PC it will be on.
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Gary CaseRetiredCommented:
... Note also that if you plan to use one UPS for all three servers, you'll need one that's designed to allow multiple PC control  ==> the higher-end APC units are very good for this.    You may find it's easier to use a dedicated UPS for each server.
I have seen older CyberPower and TrippLite systems with very limited software such as powering the OS back on... so just be weary as to which one your purchase.  APC is ok, but usually overpriced and their software has a lot of overhead, especially for smaller deployments.
Again, keep in mind that the BIOS settings have NO effect when the computer is shut off gracefully by the attached UPS.  You will have to have a UPS with signaling to turn the computer back on.
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