Date: Wed, 2 Jan 2013 12:49:14 -0500 From: Paul Mather <paul@gromit.homeunix.org> To: stable@freebsd.org Subject: Upgrade of RELENG_8 ZFS boot pool leads to unbootable system Message-ID: <FA810100-4041-40D7-AE09-77E07C1E3206@gromit.homeunix.org>
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Yesterday, I updated my RELENG_8 ZFS-only system that has worked like a =
champ for ages. After a successful install{kernel,world} and reboot, I =
noticed the 20121130 entry in /usr/src/UPDATING and upgraded my ZFS pool =
via "zfs upgrade -a". I also upgraded my boot blocks as requested, and =
as per the "ZFS notes" section of /usr/src/UPDATING.
Unfortunately rebooting with the upgraded pool failed. The "windmill" =
boot spinner spins for a tiny amount of time and then stops dead. :-( I =
don't get to the boot loader menu at all.
I downloaded a very recent RELENG_8 snapshot =
(FreeBSD-8.3-RELENG_8-r244923-JPSNAP-amd64-amd64-memstick.img) from =
pub.allbsd.org and was able to boot successfully from USB using that. I =
entered Fixit Mode and tried to write the boot blocks on the memstick =
image onto my hard drives but the resultant system still wouldn't boot. =
The commands I used (from Fixit Mode) are these:
gpart bootcode -b /dist/boot/pmbr -p /dist/boot/gptzfsboot -i 1 =
ad4
gpart bootcode -b /dist/boot/pmbr -p /dist/boot/gptzfsboot -i 1 =
ad6
(ad4 and ad6 are my two hard drives.)
If I "load zfs" before booting the USB memstick then I can see my old =
pool listed when I do "zfs import". I haven't tried importing the pool =
because I'm not sure if that would make the problem worse.
Does anyone have any advice in restoring this system to bootability? I =
followed the standard "root on ZFS" recipe using a two drive mirror when =
installing the system initially. Each drive uses GPT with three =
partitions: freebsd-boot, freebsd-swap, and freebsd-zfs in that order. =
Like I said at the start, all this worked for a long time until just now =
when I upgraded the pool to enable "feature flags" support. :-(
Any help is appreciated.
Cheers,
Paul.
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