Re: [Xen-devel] determining if a backend device is not working

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 10/03/2009 01:46, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

> In my gplpv drivers, the best I have come up with to determine if the
> backend is not working is to wait for a few seconds (30 currently), and
> if the backend state hasn't changed by then then I assume that it's
> broken.
> 
> Is there a better way? The situation where this comes up is when
> something like ',hdc:cdrom,r' is specified in the config file.
> 
> Even though I set all of the frontend up, the backend just stays at
> state 2 instead of transitioning to 4.

I think we expect backends to always be responsive. So we have no model for
what to do if that assumption breaks. Your particular example above sounds
like a weird backend bug?

 -- Keir



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