Bug#708451: kfreebsd-image-9.0-2-amd64: fails to boot from ZFS

[christian mock <cm@tahina.priv.at>]

On Wed, May 15, 2013 at 09:14:06PM +0100, Steven Chamberlain wrote:
> Hi!
> 
> On 15/05/13 20:49, christian mock wrote:
> > Mounting from zfs:backup-z0/root failed with error 6.
> 
> > The issue might be related to the fact that the kernel tells me it's now
> > naming the disk devices "ada0" and "ada1" instead of "ad4" and "ad6" [...]
> 
> Can I assume these disks are partitioned, probably with an msdos disklabel?

You can, indeed.

> And does the ZFS partition on each disk extend to the end of the drive?

Yup. It's the only partition on the drives.

> Please try editing the boot commands in GRUB, and add "set
> kFreeBSD.vfs.zfs.debug=1";  then you may be able to see exactly what
> goes wrong.

Will do, but not now, it's nearly midnight; I'll be out of town until
next tuesday and when I return I'll give it a try.

> > I find the old device paths (e.g. /dev/ad4) in zpool.cache.
> 
> What is supposed to happen is, since it can't find /dev/ad4, the kernel
> searches all disks and partitions for a ZFS volume matching the expected
> UUID.

I have, in the meantime, booted from the wheezy installer CD with the
9.0 kernel and generated an updated zpool.cache:

zpool import -f -o cachefile=/tmp/zpool.cache -o altroot=/mnt backup-z0

This worked.

ciao,

cm.

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