ZFS rpool Upgrade and GRUB

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After a zpool version upgrade on an rpool, it is necessary to recreate all files used by grub.

After zpool upgrade, before reboot

If you prepared your upgrade carefully and did not already reboot, follow these steps before rebooting: 

touch /etc/system # make bootadm re-create archive
bootadm update-archive
/boot/solaris/bin/update_grub

If system does not boot after rpool upgrade

If you're already lost after an upgrade, follow these steps to recover:

  • Boot from a current snv CD (needs to support the zpool version you have upgraded to). ISOs available at http://www.genunix.org/
  • Import your rpool 
mkdir /tmp/rpool
zpool import -R /tmp/rpool rpool
    • if this fails, get the pool ID with zpool import, then use 
zpool import -f -R /tmp/rpool <ID>
  • Mount root-fs 
mount -F zfs rpool/ROOT/opensolaris-X /mnt

The next steps are identical to the procedure before reboot

  • update boot-archive 
touch /mnt/etc/system
bootadm update-archive -R /mnt
  • update grub 
/mnt/boot/solaris/bin/update_grub -R /mnt
  • umount, export 
umount /mnt
zpool export rpool
Retrieved from "http://wiki.genunix.org:8080/wiki/index.php/ZFS_rpool_Upgrade_and_GRUB"
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