Unable to boot from zfsroot 9.0-RC2 (while 9.0-RC1 boots fine)

[Darren Baginski]

I did 'mfs' install years back .
Please note, I'm not talking about *clean* install, but rather setup which worked for 8.0, 8.1, 8.2, 9.0-beta1, 9.0-beta2, 9.0-beta3, 9.0-RC1 up to November 8 (I csup-ing frequently on that box).
 But suddenly, today's 9.0-RC2 kernel from won't boot.
I'm considering that as a regression, if something worked for so long time and stopped.
Was there any changes related to subject in kernel ?


11.11.2011, 22:34, "Peter Maloney" <peter.maloney at brockmann-consult.de>:
> Darren,
>
> Did you try the normal procedure, or is it something specific to version 9?
>
> *normal procedure:*
>  From a boot cd, do something like this:
>
> import, and if it fails, go ahead and use -f
> # zpool import -o altroot=/z -o cachefile=/tmp/zpool.cache zroot
>
> # zfs set mountpoint=/ zroot
>
> # cp /tmp/zpool.cache /z/boot/zfs/zpool.cache
>
> Optionally here you set mountpoint back to legacy (which is what you
> showed in your message).
> # zfs umount -a zroot
> # zfs set mountpoint=legacy zroot
>
> (As you can see I have not exported the pool, which is mandatory [I
> think  it is considered a bug and was supposed to be fixed in 9].
> Also note I left the mount point as "/" rather than "legacy", which is
> optional.
> At this point, I rebooted and removed the original to test.)
>
> Here is a reference to a very similar solution... scroll down to mm's
> post, or search for the text "Therefore I suggest"
>
> http://freebsd.1045724.n5.nabble.com/Difficulties-to-use-ZFS-root-ROOT-MOUNT-ERROR-td4771828.html
>
> *and also another note*, you need to make sure your first zfs slice on
> the disk is the root one.
>
> eg. This will definitely not boot if the log and cache are for another
> pool. I think they also might not boot if they are log and cache for zroot:
>
> # gpart show -l
> =>       34  500118125  da5  GPT  (238G)
>           34       2014       - free -  (1M)
>         2048        128    1  (null)  (64k)
>         2176       1920       - free -  (960k)
>         4096    1048576    2  swap0  (512M)
>    168824832    8388608    3  log0  (4.0G)
>    177213440  322904064    4  cache0  (154G)
>      1052672  167772160    5  root0  (80G)
>    500117504        655       - free -  (327k)
> (note I edited the above... the numbers don't make sense, just the order)
>
> Peter
>
> Am 11.11.2011 15:31, schrieb Darren Baginski:
>
>>  Hi!
>>
>>  I'm having troubles booting today's 9.0-RC2 from zfsroot, I'm getting 'unknown filesystem' error.
>>  But  9.0-RC1 from Tue Nov  8 2011 boots fine.
>>
>>  Here is output with 9.0-RC1 kernel:
>>
>>  # zpool list
>>  NAME    SIZE  ALLOC   FREE    CAP  DEDUP  HEALTH  ALTROOT
>>  zroot  5.97G  2.85G  3.11G    47%  1.00x  ONLINE  -
>>
>>  # zfs list
>>  NAME                      USED  AVAIL  REFER  MOUNTPOINT
>>  zroot                    2.85G  3.02G  2.85G  legacy
>>
>>  # cat /boot/loader.conf
>>  zfs_load="YES"
>>  vfs.root.mountfrom="zfs:zroot"
>>
>>  Originally that box with installed with FreeBSD 8.x, but continuously updated up to today's version, so :
>>
>>  VER  FILESYSTEM
>>  ---  ------------
>>    4   zroot
>>
>>  VER  POOL
>>  ---  ------------
>>  15   zroot
>>
>>  Any suggestions ? What could be the problem?
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