Re: dumpdev in loader.conf vs rc.d/dumpon

From: Andriy Gapon <>
Date: Wed, 23 Sep 2015 19:05:16 +0300
On 23/09/2015 18:59, Conrad Meyer wrote:
> On Wed, Sep 23, 2015 at 7:37 AM, Andriy Gapon <> wrote:
>> I have recently discovered 'dumpdev' kernel environment variable that is
>> settable, for example, from loader.conf.  To me it *seems* that this variable
>> has to be set to a device name / path without the leading '/dev'.
> Why?

Because that's how I read the code in sys/geom/geom_dev.c.  Especially
init_dumpdev() - I believe that devtoname() returns a device name without '/dev/'.

>> If that's so,
>> then rc.d/dumpon must prepend '/dev' when passing the value of 'dumpdev' to
>> dumpon(8).
> dumpon(8) opens the configured file (accessible in the normal
> namespace, i.e. "/dev/ada0s1b") and uses a magical ioctl on the device
> to configure it as the dump device.  This is all documented in
> dumpon(8).  Additionally, dumpon.c is short and quite legible.


> I don't see etc/rc.d/dumpon prepending /dev to anything.

Right, that's why I posted my message (bug report).

Andriy Gapon
Received on Wed Sep 23 2015 - 14:06:16 UTC

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