Right now, zfs boot is a bit too experimental for us. The website seems to have stripped some tags.
Here are the full errors bash-3.00# lucreate -c u6 -n b106 -m /:/dev/md/dsk/d1:ufs,mirror -m /:/dev/dsk/c1t1d0s0:detach,attach,preserve Discovering physical storage devices Discovering logical storage devices Cross referencing storage devices with boot environment configurations Determining types of file systems supported Validating file system requests The device name "/dev/md/dsk/d1" expands to device path "/dev/md/dsk/d1" ERROR: option "detach" device "c1t1d0s0" is not a component of any metadevice: "/dev/dsk/c1t1d0s0" ERROR: option "detach" device "c1t1d0s0" must be configured as a single device concat ERROR: cannot validate file system "/" option "detach" devices "/dev/dsk/c1t1d0s0" ERROR: metadevice file systems configuration is not valid ERROR: cannot create new boot environment using file systems as configured ERROR: please review all file system configuration options ERROR: cannot create new boot environment using options provided -- This message posted from opensolaris.org