I cant really offer any suggestions, but what youre reporting is consistant with what will happen when using an unpatched scsi.device and/or file system not being able to read beyond 8 gig. I very strongly recommend using either pfs3 or sfs rather than ffs. If Im not mistaken ffs cant read beyond 4 gig, but more importantly is very prone to invalidating a disk if its in use when the system is rebooted. Not to mention its also quite slow.
