Re: gmirror / crash dumps

On Fri, Jul 31, 2009 at 12:46:32AM -0500, Adam Vande More wrote:
> On Thu, Jul 30, 2009 at 11:23 PM, Philip M. Gollucci
> <pgollucci_at_p6m7g8.com>wrote:
> 
> > Hi,
> >
> > Say I've got the following:
> > /dev/mirror/gm0s1b    none            swap    sw
> >
> > /dev/mirror/gm0s1a    989M    390M    520M    43%    /
> > /dev/mirror/gm0s1g     15G    1.7G     12G    13%    /usr
> > /dev/mirror/gm0s1h    544G    1.8M    501G     0%    /usr/home
> > /dev/mirror/gm0s1d    1.9G    500M    1.3G    27%    /usr/src
> > /dev/mirror/gm0s1e    1.9G    1.1G    733M    60%    /usr/obj
> > /dev/mirror/gm0s1f     97G    2.0K     89G     0%    /var
> >
> > Well I'm trying to get my kernel panics to cause dumps
> > 1) /etc/rc.conf
> > dumpdev=AUTO
> > crashinfo_enable="YES"
> >
> > 2) sudo chmod 700 /var/crash
> >
> > 3) 8GB RAM, 16GB of swap, /var/crash is 16GB < 97GB
> >
> > 4) I have the following in my 7-stable kernel
> > makeoptions     DEBUG=-g
> > options         AUDIT
> > options         KTRACE
> > options         KDB
> > options         KDB_TRACE
> > options         DDB
> > options         GDB
> > options         BREAK_TO_DEBUGGER
> > options         INVARIANTS
> > options         INVARIANT_SUPPORT
> > options         WITNESS
> > options         DEBUG_LOCKS
> > options         DEBUG_VFS_LOCKS
> > options         LOCK_PROFILING
> > options         DIAGNOSTIC
> >
> > The long and the short of it is I don't get any dumps.
> >
> > I read somewhere that you can't dump onto a gmirror device.
> 
> 
> That is incorrect, but I don't know the cause of your problem.  I run
> nothing but gmirror and dumps happen here.

I was also told that 

	"you won't get a valid dump if your dumpdev
	 is on a GEOM_MIRROR device"

http://lists.freebsd.org/pipermail/freebsd-ia64/2009-July/002205.html

-- 
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 928 8233 
Fax: +44 (0)117 929 4423