fixing a busted ZFS upgrade

[David Newman]

On 7/29/10 3:18 PM, Martin Matuska wrote:

> 
> 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.

Nearly a year ago mfsBSD saved me from a munged 8.0->8.1 upgrade of a
ZFS box and allowed me to revive a ZFS root partition.

I've done the same stupid thing again in moving from 8.1 to 8.2, only
now the server won't boot from the 8.2 mfsBSD ISO, or the 8.1 ISO. In
both cases it hangs at loader.conf.

Thanks in advance for any clues on reviving this system.

dn



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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