on 05/11/2008 18:03 Andriy Gapon said the following:
> Using GENERIC amd64 7-BETA2 system (installed from "official" ISO) I
> partitioned my disk for ZFS root file system more or less as described here:
> https://ish.com.au/solutions/articles/freebsdzfs
>
> Big difference is that I created a separate slice to contain a partition
> for ZFS pool, so that ZFS pool is ad4s2d (and UFS2 boot is ad4s1a).
>
> Everything was fine, ZFS root was mounted as expected.
>
> Then I built a custom kernel with nooptions for GEOM_(BSD|MBR) and
> options for GEOM_PART_(BSD|MBR). When I tried to boot this kernel it
> couldn't mount ZFS root and I simply rebooted my machine when I stuck at
> mountroot prompt (I couldn't enter UFS2 root because of unrelated
> keyboard problem).
> The boot was verbose and I didn't see any peculiar GEOM or GEOM_PART
> messages (errors, warnings).
>
> I'll try to debug this further by booting into UFS root and running
> gpart, but I'd like to ask for an advice upfront.


So I did this.
Here are some data:
$ gpart show
=> 63 976773105 ad6 MBR (500.1GB)
63 12578832 1 freebsd [active] (6.4GB)
12578895 964189170 2 freebsd (493.7GB)
976768065 5103 - free - (2.6MB)

=> 0 12578832 ad6s1 BSD (6.4GB)
0 16 - free - (8.2KB)
16 2097152 1 freebsd-ufs (1073.7MB)
2097168 2097152 - free - (1073.7MB)
4194320 8384512 2 freebsd-swap (4.3GB)

=> 0 964189170 ad6s2 BSD (493.7GB)
0 16 - free - (8.2KB)
16 964189154 4 freebsd-swap (493.7GB)

$ zpool status
pool: tank
state: UNAVAIL
status: One or more devices could not be opened. There are insufficient
replicas for the pool to continue functioning.
action: Attach the missing device and online it using 'zpool online'.
see: http://www.sun.com/msg/ZFS-8000-D3
scrub: none requested
config:

NAME STATE READ WRITE CKSUM
tank UNAVAIL 0 0 0 insufficient replicas
ad6s2d UNAVAIL 0 0 0 cannot open

So gpart sees ad6s2d perfectly well, it has the same parameters as
disklabel previously reported and /dev/ad6s2d exists. But zfs "cannot
open" it.

What I did next was:
1. reboot into "disklabel" kernel single-user
2. zpool export tank
3. reboot into gpart kernel single-user
4. zpool import - it saw tank correctly
5. zpool import tank
6. profit! :-)

As I see it, zpool.cache contained something about ad6s2d that prevented
gpart ad6s2d from being recognized as the same device as "disklabel"
one. I really wonder what that could have been?
Or maybe gpart reported some subtle property of the device differently...

--
Andriy Gapon
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