How to Identify failed Hard drive in Netapp

Filer> aggr status -f

Broken disks

RAID Disk       Device  HA  SHELF BAY CHAN Pool Type  RPM  Used (MB/blks)    Phys (MB/blks)
---------       ------  ------------- ---- ---- ---- ----- --------------    --------------
failed          2a.33   2a    2   1   FC:B   0  FCAL 15000 418000/856064000  420156/860480768


Filer> priv set advanced
Warning: These advanced commands are potentially dangerous; use
         them only when directed to do so by NetApp
         personnel.
Filer*> blink_on  2a.33 ( here i make the failed hard drive to blink, so i have a visual idication of the failed drive)