Hello, thanks for all the valuable contributions. Sorry for the long silence, but I was kept busy by other chores ...
The chainloading problem is right now solved for me ... doesn't mean that there is still a general problem. I recently upgraded to Grub 2 (1.97~beta4-1ubuntu4) with Karmic Koala. This version of Grob does no longer have problems chainloading the Grub which came with OpenSolaris. I will try to natively boot OpenSolaris by the Grub which came with Karmic ... there is a zfs module to load ... maybe it works. Take care, Martin -- This message posted from opensolaris.org