Power-managment of slave nodes

[Velocet]

On Tue, Mar 06, 2001 at 02:09:53PM -0600, Kyle Sheumaker's all...
> I have played with wake-on-lan and not had a lot of luck.  It is a special
> packet (http://www.scyld.com/expert/wake-on-lan.html), but some motherboards
> / nics just don't seem to want to "wake."
> 
> They aren't cheap but I would suggest something like the APC masterswitch,
> it's a network controllable power switch
> (http://www.apc.com/products/masterswitch/index.cfm).  I've used them before
> their pretty cool, web, telnet, and SNMP controllable.

Could also try wake on MODEM as well - just write up a DC9 connector
for the serial port, and tweak whatever pin it is that it listens on
(could be RING or CD pins or both). Alot of BIOSes support wake on modem.

Could also set it to wake on serial mouse, same idea. Just tweak the 
RX pin - my Windoze box at home wakes when I hit the mouse, so I know
it must be doing something like that. The mouse still has power enough
to send a signal back to the board and the system wakes. If its not
in full 'power off' but just in standby, then all the better - standby
mode might be low power enough for what you are looking for, if it
actually ramps down the MHZ of the CPU and all that. (I know my
power supply fan isnt on when its in standby mode, so it must be
running cool enough to not need it).

/kc

> 
> -- Kyle
> 
> 
> ----- Original Message -----
> From: "Brian Marsden" <marsden at scripps.edu>
> To: <beowulf at beowulf.org>
> Sent: Tuesday, March 06, 2001 11:39 AM
> Subject: Power-managment of slave nodes
> 
> 
> > Dear all,
> >
> >  I look after a 96 processor, 48 node, Pentium III linux cluster. The
> > owners have just received their first electricity bill for the machine and
> > unsuprisingly have had a nasty shock! They are now desperate to find ways
> > to keep the bill as low as possible.
> >
> >  One solution put forward has been to have nodes shut themselves down
> > using APM when not in use. Then when a node is needed for a job, it could
> > be switched back on via wake-on-LAN on the ethernet card. I see a number
> of
> > problems associated with this:
> >
> > 1) APM is not supported under Linux 2.2 for SMP. However I believe that it
> >    is for 2.4 - can anyone comment on this?
> > 2) Wake-on-LAN - I'm not 100% clear on whether this listens for a specific
> >    packet or whether it will just fire the machine up if a packet comes
> >    along with the NICs MAC address. If the later is the case I think we
> >    are snookered since we use PBS as the queueing system which I believe
> >    sends out packets to query nodes every now and then.
> >
> >  Before I spend more time delving deeper into these problems, has anyone
> > ever attempted to try to do all of this? If so, what are the perils and
> > pitfalls? Is this a completely crazy idea?
> >
> > Thanks
> >
> > Brian.
> >
> > --
> > ---------------------------------------------------------------------
> >  Brian Marsden          Email: marsden at scripps.edu
> >  TSRI, San Diego, USA.  Phone: +1 858 784 8698  Fax: +1 858 784 8299
> > ---------------------------------------------------------------------
> >
> >
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> 
> 
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-- 
Ken Chase, math at velocet.ca  *  Velocet Communications Inc.  *  Toronto, CANADA