ZFS doesn't mountroot: Unable to open /dev/ad4p3 for writing (error=1).

[Yuri Pankov]

On Wed, May 12, 2010 at 12:30:09AM +0200, Pawel Jakub Dawidek wrote:
> On Tue, May 11, 2010 at 07:44:46PM +0000, Yuri Pankov wrote:
> > James R. Van Artsdalen <james-freebsd-fs2 <at> jrv.org> writes:
> > 
> > > 
> > > FreeBSD 9.0-svn207742 #0: Sat May  8 17:13:06 UTC 2010
> > > root <at> clunk.housenet.jrv:/usr/obj/usr/src/sys/GENERIC amd64
> > > 
> > > I am no longer able to boot my newly-created ZFS pools in a VirtualBox
> > > VM: the "Unable to open /dev/ad4p3 for writing" error shown below
> > > prevents the pool from being imported even though it is found.
> > > 
> > > When the pool was created it was on disk ad6, but it is now booting on
> > > ad4: zpool.cache contains wrong disk names so the kernel finds the pool
> > > member(s) by guid, not name.
> > <snip>
> > 
> > Same here on recent -CURRENT. I recently needed to disable ahci(4) driver (pool
> > was created on ada0p3), and got the same error about ad4p3 (device name without
> > ahci driver).
> 
> It should be worked around in r207936. Could you guys try it?
> 
> -- 
> Pawel Jakub Dawidek                       http://www.wheelsystems.com
> pjd at FreeBSD.org                           http://www.FreeBSD.org
> FreeBSD committer                         Am I Evil? Yes, I Am!

Worked like a charm, successfully booted from ad4p3 (no ahci and ATA_CAM).


Thanks,
Yuri