Re: [Xen-users] Watchdog support in XEN?

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> forgive me if I'm misunderstanding something but it seems to me that one
> would want to use a hardware watchdog on dom0 so if the system should
> well and truly fail, an undeniable reset could be applied to the entire
> system.  But if dom0 is healthy, then yes, a software watchdog in dom0
> paying attention to and deciding when to reset the various domU's should
> be sufficient.

I think you'd ideally want both:
* Hardware watchdog in dom0 in case dom0 or Xen crashes
* Software watchdog for domU is provided by dom0 (which we can guarantee is up 
because of the hardware watchdog) via the store

In the absence of a hardware watchdog, you could also implement a software 
watchdog for dom0 in Xen itself, which is likely to be the most reliable 
piece of code in the system and shouldn't lock up even if dom0 does.

Cheers,
Mark

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