[Linux-ha-dev] Re: STONITH implementations

Alan Robertson alanr at suse.com
Thu Apr 27 20:40:32 MDT 2000


Horms wrote:
> 
> On Thu, Apr 27, 2000 at 10:42:07AM -0600, Alan Robertson wrote:
> > Folks,
> >
> > Does anyone know of any existing code for operating one or more kinds of
> > remote power-off/reset devices suitable for a STONITH/STOMITH approach.
> >
> >       STONITH/STOMITH:
> >
> >               Shoot
> >               The
> >               Other
> >               Node/Machine
> >               In
> >               The
> >               Head
> 
> VACM http://vacm.sourceforge.net/ has support for controlling
> Baytek power strips.

Thanks Horms!

It's good information, but it looks like it'll take a little tweaking
for use with heartbeat or FailSafe.  It has lots of tie ins to the VA
clustering infrastructure, and it is only set up to work with serial
communication.  Serial isn't suitable for STONITH, because all nodes
need to be able to power each other off independently.

However, the code clearly shows how to operate the switches, and the
Baytek hardware seems reasonably nice.  They have models that support
having each machine be on it's own UPS, and some models provide telnet
support.  Unfortunately, they seem to cost around $150/port.

One nice thing about telnet.  If they only support one caller at a time,
then this eliminates each machine shooting the other in the head
simultaneously.  Unfortunately, it also means that when the hub goes
out, STONITH won't work.  This could be a real problem unless you have
redundant heartbeat mechanisms to minimize the possibility of a split
cluster occurring for this reason...  Hmmm...

	-- Alan Robertson
	   alanr at suse.com



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