This post mentioned that servers can be powered on when given power (useful for remote power up by PDU).
Does anyone know if Dell PowerEdge servers have this options (particularly 2950 and 2850s). Also, will Cisco 3825 / 2800 router work this way?
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The PE2850 and PE2950 servers do in fact have a BIOS setting to control the power state. Cisco devices have no BIOS level settings to control power and are controlled soley by the state of the power switch.
The PowerEdge systems should have an option in the BIOS that says something along the lines of "resume after power loss" or something to that effect. Enable it, and you should be able to boot from there. If your Dells have DRACs, you should be able to power them on with that, as well.
The Cisco routers, I'm not particularly sure, but I would imagine that they do have this option somewhere in them.