Power-managment of slave nodes

Wed Mar 7 05:53:45 PST 2001

Hi,

Not directly related.

But I was wondering with a similar APC master switch, I can actually
powered off (then on) a "dead" slave node when it is found to have hung.
After recycling the power of that node, it can rejoin the cluster without
any intervention from the user. Has anyone used it for such purpose, or is
there another way of recycling a dead node with manual intervention? Or a
cheaper way?

(This is of course assuming the program is able to handle the interrupt in
the number of available slave nodes.)

Regards,
Kian Chang.

                    "Kyle Sheumaker"                                                                
                    <ksheumaker at advancedclust        To:     "Brian Marsden" <marsden at scripps.edu>, 
                    ering.com>                       <beowulf at beowulf.org>                          
                    Sent by:                         cc:                                            
                    beowulf-admin at beowulf.org        Subject:     Re: Power-managment of slave      
                                                     nodes                                          

                    03/07/01 04:09 AM                                                               

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.

-- 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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