Re: Wake on lan (WOL) on SGI Octane?

From: Walter Roberson (roberson_at_ibd.nrc-cnrc.gc.ca)
Date: 03/10/04

  • Next message: Khalid Schofield: "Re: Wake on lan (WOL) on SGI Octane?" 
    Date: 10 Mar 2004 16:43:59 GMT

    In article <4c0f502e.0403100805.14aae8a5@posting.google.com>,
    Nodrahc Technologies Inc. <info@nodrahc.com> wrote:
    :I would like to know if I can wake up an Octane remotely, by issuing a
    :WOL or any other method. I have a couple of Octanes at a remote site
    :that I use only a few hours a month, and I would like to keep them off
    :as much as possible (noise, heat and electricity...). Turning them on
    :using the timer is not good because I don't need them at a paricular
    :time, it could be anytime.

    No. There is a system function to tell them to wake themselves up at
    a particular time (no external timer needed), but there is no WOL.

    There's a trick I used to use in a different context that might be useful
    for you:

      I used to use dialup modem from my I^2 to work, and sometimes I'd be
    at work and want to access my system at home. I didn't want to use uugetty
    because I personally find uugetty to be broken, but more importantly it
    was my only phone line and I didn't want my voice callers to be getting a
    modem. So what I did was set up a cron tab on the I^2 at home to ping
    work a few times every 1/2 hour or hour. That'd cause dialup, the
    connection would establish, and it would normally shut itself down again
    a short time later from idleness. But when I had something I wanted to do
    over the connection, I'd start up a ping in the reverse direction, from
    work to home. The ping packets would normally go nowhere, but when the
    I^2 from home called up, suddenly the pings would start getting through,
    and the line would no longer be idle and the connection would stay up until
    I noticed it was there and did whatever I needed to do and released it.

    So... you could adjust this strategy by having your Octane wake itself up
    periodically and checking -something- to see if it was wanted, and if so then
    to stay awake, and otherwise go back to napping.

    Note: with some models of hard disks (some of the IBM models in particular)
    there is a way to spin down the hard disk while the system is still running.
    The spindown utility is invoked from the root crontab a couple of times
    a week -- it's there to avoid a buildup of "stiction". If you happened to
    have the right kind of disk, then you might want to explore whether you
    can reduce noise, etc., by spinning down the disk until the next time
    the Octane should check for work. 

    -- 
   Sub-millibarn resolution bio-hyperdimensional plasmatic space
   polyimaging is just around the corner.   -- Corry Lee Smith
  • Next message: Khalid Schofield: "Re: Wake on lan (WOL) on SGI Octane?"

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