Re: no dump on a gmirror ?

On Mon, 20 Feb 2006 13:25:05 -0600
"Larry Rosenman" <ler_at_lerctr.org> wrote:

> Doug Barton wrote:
> > Larry Rosenman wrote:
> >> Thierry Herbelot wrote:
> >>> Hello,
> >>> 
> >>> I have recently converted a machine to a full gmirror configuration
> >>> (as explained on http://people.freebsd.org/~rse/mirror/ :
> >>> everything, including swap, is mirrored). 
> >>> 
> >>> The dump device is configured as AUTO from /etc/defaults/rc.conf and
> >>> the kernel complains when booting that "No suitable dump device was
> >>> found". 
> >>> 
> >>> Is this to be expected ? (I do not find any hint in gmirror(8) or
> >>> dumpon(8))
> >> 
> >> Yes, unfortunately.
> >> 
> >> I wish someone would change it, as if I get a system panic, I'll
> >> not be able to help fix it.
> > 
> > Does specifying a device, rather than using AUTO, work for you?
> > 
> > Doug
> 
> as in?
> 
> # dumpon /dev/mirror/gm0s1b
> dumpon: ioctl(DIOCSKERNELDUMP): Operation not supported
> #
> 
> Feb 20 13:23:03 thebighonker kernel: Loading configuration files.
> Feb 20 13:23:03 thebighonker kernel: dumpon:
> Feb 20 13:23:03 thebighonker kernel: ioctl(DIOCSKERNELDUMP)
> Feb 20 13:23:03 thebighonker kernel: :
> Feb 20 13:23:03 thebighonker kernel: Operation not supported
> 
> # cat /etc/rc.conf
> hostname="thebighonker.lerctr.org"
> dumpdev="/dev/mirror/gm0s1b"
> 
> so, no it doesn't.
> 
> I don't believe I can get at the "b" slices of the individual disks
> (da0/da1).
 
You may try the same trick as NetBSD uses with RAIDframe:
http://www.netbsd.org/guide/en/chap-rf.html#chap-rf-setup-kerneldump

Cheers,
Marcin.