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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