[Discuss] How can I resume from S1 (STR) mode in Ubuntu?

[kkeville at MIT.EDU (Kurt L Keville)]

Indeed. Throttling down the server power usage is exactly the purpose of my
exercise here. I want to show mostly the availability of this solution rather
than any determination of the utility of same. According to
http://ebscosustainability.files.wordpress.com/2010/06/data-center-energy-efficiency.pdf
  even an efficient server still uses about half its full power when doing
virtually no work so it would be great if we had an easy to use, CPU-load
checking, aggressive power management system.

I have tested using cpufreq-set to slow my boxes down to a crawl with very
little effect on power usage so I think using suspend or hibernate are 
a couple
of the few options I have left. I'll try some of your suggestions; 
hooking up a
digiboard and multiplexing out serial access, or using jabr's idea, but I
wonder if suspend will turn off access to everything but usb and / or ps2,
which is where it is expecting to get a mouse wiggle from...

Thanks for the help... I'll keep you posted... I also bought some 
IP-addressable
plugstrips and will test upsd and nut with it. Shutdowns may be a little too
aggressive though; I don't think I have that much time between jobs!

> On Thu, May 17, 2012 at 09:57:53AM -0400, Kurt Keville wrote:
>> Thanks... I'll give that a test... my big problem is (or will be)
>> lack of physical access to the servers and I figure this has to have
>> been bumped into out there in Datacenterland by someone... Federico
>> pointed me at powernap which appears to have some hook options that
>> might fit the criteria...
>
> Another potential solution to this, depending on the details of your
> arrangement, is to set up console access on the serial port, and then
> use a terminal server or similar device to access the console over the
> serial port.  Especially if you're going to have a rack full of
> servers set up this way, it can come in quite handy.
>
>  http://www.howtoforge.com/setting_up_a_serial_console
>
> IIRC server-class hardware (maybe all hardware these days?) can also
> be configured to provide bios access on a serial port, e.g.:
>
>  
> http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00440332/c00440332.pdf
>
> I agree with Jerry that your server machines should have ACPI power
> settings disabled so they just never sleep.  Much modern hardware does
> have a wake-on-lan feature, though IIRC you need to send it a
> particular type of network message for that to work (and it needs to
> be enabled).  But there's really no reason for a machine intended to
> act as a server to ever go to sleep, unless you are the only one who
> will ever access it, and you're prepared to wake it up every time you
> want to do so.
>
> --
> Derek D. Martin    http://www.pizzashack.org/   GPG Key ID: 0xDFBEAD02
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