TRY TO VXFS FILE SYSTEM WITH UFS IN SOLARIS 10? (NOTICE: mount: not a UFS magic number (0x0))

I obtained this errore because i tried to mount a ufs filesystem when the volume was vxfs!

# mount /dev/vx/dsk/dg1/vol01 /mnt

May 25 16:23:10 gri2 ufs: NOTICE: mount: not a UFS magic number (0×0)
mount: /dev/vx/dsk/zonepath_gri2_DG/zonepath_gri2_vol01 is not this fstype


 # fstyp /dev/vx/dsk/dg1/vol01
vxfs


So , i mounted the filesystem with vxfs option:
mount -F vxfs /dev/vx/dsk/dg1/vol01 /mnt