to clear drive without rebooting

to clear drive without rebooting
---------------------------------

p/s make sure the disk that need clear is not in use anymore.

format      

       5. c6t0d1
          /pci@8,700000/lpfc@3/sd@0,1
       6. c6t0d2
          /pci@8,700000/lpfc@3/sd@0,2
       7. c6t0d3
          /pci@8,700000/lpfc@3/sd@0,3
       8. c6t0d4


-root ~: powermt check
Warning: Symmetrix device path c6t0d1s0 is currently dead.
Do you want to remove it (y/n/a/q)? y
Warning: Symmetrix device path c6t0d2s0 is currently dead.
Do you want to remove it (y/n/a/q)? y
Warning: Symmetrix device path c6t0d3s0 is currently dead.
Do you want to remove it (y/n/a/q)? y
Warning: Symmetrix device path c6t0d4s0 is currently dead.
Do you want to remove it (y/n/a/q)? y