The easiest way of identifying which drives are which LUNs in Windows as follows :-  1) Go to Disk Management and write down the Disk Numbers along with the Drive letters. 2) Launch Powerpath Monitor Console from the System Tray (The Inverted Triangle icon beside the time) and select LUNs. This will display all the Disk #s which we got above and if you scroll to the right you will be able to get the LUN # column which now tells you the associated LUN # for that Disk #s and in turn the Drive Letter.  Hope this answers the question.  Leo
 have encounter one issue that we need to identify the lun mapped to which drive in windows 2003.I have attached powerpath and t disk status from the host side.   C:\Documents and Settings\Administrator>powermt display dev=allPseudo name=harddisk1CLARiiON ID=CKM000837005 [Server]Logical device ID=60060160CCC9220066D55EC203E8DD11 [LUN 14]state=alive; policy=CLAROpt; priority=0; queued-IOs=0Owner: default=SP B, current=SP B       Array failover mode: 1==============================================================================---------------- Host ---------------   - Stor -   -- I/O Path -  -- Stats ---### HW Path                 I/O Paths    Interf.   Mode    State  Q-IOs Errors==============================================================================   2 port2\path0\tgt0\lun0     c2t0d0    SP A1     active  alive      0      0   4 port4\path0\tgt0\lun0     c4t0d0    SP B2     active  alive      0      0 C:\Documents and Settings\Administrator> C:\Documents and Settings\Administrator>powermt versionEMC powermt for PowerPath (c) Version 5.2 SP 1  (build 10)
Identify LUN