Re: Device File Creation Time

On Wed, 2014-02-19 at 13:44 -0500, John Baldwin wrote:
> On Tuesday, February 18, 2014 3:02:16 pm Bruno Lauz=E9 wrote:
> > root@pcbsd:/dev # stat /dev/ada0
> > 1895890688 97 crw-rw-rw- 1 root operator 97 0 "Feb 18 10:52:11 2014" "F=
eb 17 =

> 09:36:43 2014" "Feb 17 09:36:43 2014" "Dec 31 17:59:59 1969" 4096 0 0 =

> /dev/ada0
> > =

> > root@pcbsd:/dev # stat /dev/ada0p2
> > 1895890688 103 crw-rw-rw- 1 root operator 103 0 "Feb 18 10:52:05 2014" =
"Feb =

> 17 09:36:43 2014" "Feb 17 09:36:43 2014" "Dec 31 17:59:59 1969" 4096 0 0 =

> /dev/ada0p2
> > =

> > root@pcbsd:/dev # stat /dev/ada0p3
> > 1895890688 105 crw-rw-rw- 1 root operator 105 0 "Feb 18 10:52:21 2014" =
"Feb =

> 17 09:36:43 2014" "Feb 17 09:36:43 2014" "Dec 31 17:59:59 1969" 4096 0 0 =

> /dev/ada0p3
> > =

> > As we can see all files in devfs reports Dec 31 1969 as creation time.
> > =

> > Can we look to manage this value to know when a certain device was =

> installed?
> > =

> > It would be really great to know when a disk was replaced.
> > =

> > Would there be any other mechanism to accomplish this?
> =

> I think if you hot attach a device post-boot it will have the time it was =

> attached as the birth time.  I think it is only devices created during bo=
ot =

> that use time 0.
> =

That's actually a time of -1 converted to some local timezone.  I'm not
sure that's germane, just thought I'd mention it.

  revolution > date -jur -1
  Wed Dec 31 23:59:59 UTC 1969

-- Ian

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