I have solved the problem in that I installed GRUB in "opensolaris-4". Here are the steps:
1. # mount -F zfs rpool/ROOT/opensolaris-4 /mnt 2. # /mnt/boot/solaris/bin/update_grub -R /mnt 3. # init 6 The caveat is that a redundant boot entry has been created inside "menu.lst". But that doesn't bother so far. The question is why the update process did not make the necessary steps to complete the update properly. Roman.
