Move File System from ZFS to UFS

# zpool create rootpool c0t1d0s1
# zfs create rootpool/rootfs
# zfs set mountpoint=legacy rootpool/rootfs
# mkdir /zfsroot
# mount  -F zfs rootpool/rootfs /zfsroot

add this entry in /etc/vfstab:

rootpool/rootfs   -                       /backup zfs     1  yes     -

Moving back from ZFS to UFS:

Identify which disk was used from zfs, in our case it was "c0t1d0s1"

#zpool destroy -R rootpool
#newfs /dev/dsk/c0t0d0s1

Check the file system

# fstyp /dev/dsk/c0t0d0s1
ufs

and mount it to use

#mount /dev/dsk/c0t0d0s1 /dirname

plz note that above mount is temporary, to make it permanent make entry in /etc/vfstab.

Comment the /etc/vfstab entry from zfs and uncomment the entry for the above partition and give

#mount -a

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Some additional command for adding/deleting & setting mount point for ZFS filesystem.

# zfs list

NAME                       USED  AVAIL  REFER  MOUNTPOINT
newpool                   11.0G   123G    94K  /newpool
newpool/ROOT              4.43G   123G    18K  legacy
newpool/ROOT/solaris10_8  4.43G   123G  4.43G  /
newpool/dump              1.50G   123G  1.50G  -
newpool/export             142K   123G    20K  /export
newpool/export/home        122K   123G   122K  /export/home
newpool/opt                 18K   123G    18K  /opt
newpool/swap                 1G   124G    16K  -
newpool/u01               4.08G   123G  4.08G  /u01

#zfs destroy -rf newpool/export
#zfs create newpool/export_home
#zfs set mountpoint=/export/home newpool/export_home

# zfs list

NAME                       USED  AVAIL  REFER  MOUNTPOINT
newpool                   14.8G   119G    94K  /newpool
newpool/ROOT              3.99G   119G    18K  legacy
newpool/ROOT/solaris10_8  3.99G   119G  3.99G  /
newpool/dump              1.50G   119G  1.50G  -
newpool/export_home        158M   119G   158M  /export/home
newpool/opt               4.08G   119G  4.08G  /opt
newpool/swap                 1G   120G    16K  -
newpool/u01               4.08G   119G  4.08G  /u01

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Reference

http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide