fixing a busted ZFS upgrade

David Newman dnewman at networktest.com
Thu Jul 29 21:36:22 UTC 2010


An upgrade from 8.0-RELEASE to 8.1-RELEASE failed on a system running a
bootable ZFS partition. The system has four SATA disks in a raidz1
configuration.

The system boots to the loader prompt and complains there's no bootable
kernel. Running 'lsmod' shows the 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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