You can install osol in your existing zpool on s6 as described [url=http://blogs.sun.com/bobn/entry/solaris_and_opensolaris_coexistence_in]here[/url].
Otherwise, you can see if the osol installer will do an install on s0, creating a new zpool. I'm pretty sure that installing osol in a UFS file system is not supported. In any case, having two zpools on the same drive is deprecated. -- This message posted from opensolaris.org
