fixing a busted ZFS upgrade

[David Newman]

Thanks very much -- updating the boot blocks on all four drives using
your ISO restored this system so it can boot.

Also, where is the UPDATING file for 8.1-RELEASE? The only file with
that name I know is in /usr/ports, and that one says nothing about ZFS.

I sorta/kinda knew that ZFS wasn't officially supported, and would be
happy to contribute documentation for the 8.0->8.1 upgrade procedure so
that others don't make the same mistake.

Thanks again.

dn



On 7/29/10 3:18 PM, Martin Matuska wrote:
>  Booting from GPT ZFS was not officially supported before 8.1-RELEASE
> 
> Here is a upgrade guide for users who want to run "zpool upgrade" on
> their ZFS boot pools:
> 
> Excerpt from 9-CURRENT UPDATING file:
> 
> BEGIN EXCERPT
> 
> ZFS notes
> ---------
> When upgrading the boot ZFS pool to a new version, always follow
> these two steps:
> 
> 1.) recompile and reinstall the ZFS boot loader and boot block
> (this is part of "make buildworld" and "make installworld")
> 
> 2.) update the ZFS boot block on your boot drive
> 
> The following example updates the ZFS boot block on the first
> partition (freebsd-boot) of a GPT partitioned drive ad0:
> "gpart bootcode -p /boot/gptzfsboot -i 1 ad0"
> 
> Non-boot pools do not need these updates.
> 
> END EXCERPT
> 
> In case the boot record is messed even more, you need to reinstall it
> completely:
> "gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ad0"
> 
> For recovering a system that does not boot anymore, you can use mfsBSD
> ISO's:
> http://mfsbsd.vx.sk
> 
> You can boot from the iso and repair the boot record.
> I recommend you check your gpart partitions with "gpart show" and verify
> discovered pools with "zpool import"
> (without any flags or arguments) first.
> 
> mm
> 
> Dňa 29. 7. 2010 23:03, David Newman wrote / napísal(a):
>> Attempting to upgrade an 8.0-RELEASE to 8.1-RELEASE failed on a system
>> running a bootable ZFS partition.
>>
>> The system boots to the loader prompt and complains there's no bootable
>> kernel. Running 'lsmod' shows there are four ZFS disks present.
>>
>> Thanks in advance for clues on fixing this, and also on the right way to
>> upgrade FreeBSD systems with bootable ZFS partitions.
>>
>> Steps to reproduce:
>>
>> 1. Build 8.0-RELEASE system following the freebsd.org wiki:
>>
>> http://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/RAIDZ1
>>
>> In this case the system uses raidz1 across four SATA drives.
>>
>> 2. Upgrade to 8.1-RELEASE using the 'FreeBSD Update' directions:
>>
>> http://www.freebsd.org/releases/8.1R/announce.html
>>
>> 3. After first reboot, system boots to the loader prompt.
>>
>> dn
>>
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