[mythtv-users] Can a diskless frontend WOL the backend?

Dawson, Guy Guy.Dawson at eu.sony.com
Thu Jun 1 07:47:00 UTC 2006


> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org 
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Scott Colbeck
> Sent: 01 June 2006 04:24
> To: mythtv-users at mythtv.org
> Subject: [mythtv-users] Can a diskless frontend WOL the backend?
> Does anyone know if a diskless frontend could send a WOL 
> magic packet to turn on the backend as part of the boot 
> process?  The backend is where the frontend's kernel and root 
> filesystem reside.
> My backend is setup to automatically wake up and shut down 
> for scheduled recordings.  Currently to boot the frontend, if 
> the backend is not already up, I have to first walk into the 
> other room and manually turn the backend on.
> If I can't WOL the backend with a completely diskless 
> solution, is it possible to do this with a small CF card in 
> the frontend?  I attempted this with the kernel on the CF 
> card but wasn't able to figure out how to send the WOL magic 
> packet before the root filesystem attempted to be NFS mounted.
> My frontend is a VIA Epia M10000 running Gentoo.
> Thanks for your help.

This might be a long shot,  but my current Myth box used to wake itself up
for no apparent reason.  When I looked into this I found that I had
inadvertently set it to WOL AND set the ethernet interface (using ethtool?)
to wake up of broadcast packets.  

When the you diskless box starts, it will most likely broadcast looking for
a DHCP,  and you might be able to use that to wake the backend.

I suppose the big problem would be whether there are any other broadcasts
flying about.

Just a thought

Guy Dawson

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