[dm-devel] help:"event number"

[tom z]

Thanks,i got it.
But i have another question.Sometimes, i can't remove the device, in the
"dmsetup man", it said "because an uninterruptible process is waiting for
I/O to return from it", and what should i do for getting the PID or
something about this "uninterruptible process"? I know adding "--force" can
help me remove the device, but i am worried about this action will cause I/O
broken.

On Mon, Jan 17, 2011 at 11:29 AM, Alasdair G Kergon <agk at redhat.com> wrote:

> On Mon, Jan 17, 2011 at 10:12:51AM +0800, tom z wrote:
> >    What's the meaning of the "Event number". Is it number of the device's
> > I/O event? If the number is greater to zero, it means the I/O request's
> > happening?
>
> No.  Just means something happened that userspace ought to know about,
> like a path failing.  Used by 'wait' - see 'man dmsetup' and
> http://people.redhat.com/agk/talks/FOSDEM_2005/text51.html .
>
> Alasdair
>
>
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