AIX is funky like that, it's hdisk number will not match LUN address you assigned on FA, for example here is output from lspv  hdiskpower8     00cb0d2fc39753f9                    tsmlogvg        active  now when i run "powermt display dev=all" i see this information (this is a test server with only one path to storage, typically you will see two hdisk devices)  Pseudo name=hdiskpower8Symmetrix ID=000000100123Logical device ID=2AF5state=alive; policy=SymmOpt; priority=0; queued-IOs=0==============================================================================---------------- Host ---------------   - Stor -   -- I/O Path -  -- Stats ---### HW Path                 I/O Paths    Interf.   Mode    State  Q-IOs Errors==============================================================================   0 fscsi0                    hdisk11   FA  8cA   active  alive      0      0  so as you can see my symmetrix device id is 2AF5, PowerPath device is hdiskpower8 and native AIX device is hdisk11. If i run "symdev show 2AF5 -sid 123" ..you will see this output (snipped for abrivity)   Front Director Paths (1):        {        ----------------------------------------------------------------------                                 POWERPATH  DIRECTOR   PORT             LUN                                 --------- ----------  ---- -------- ---------        PdevName                 Type      Type Num    Sts  VBUS TID SYMM Host        ----------------------------------------------------------------------        Not Visible              N/A       FA   08C:0  RW   000  00  0B8  N/A        }    Mirror Set Type          : [RAID-5,RAID-5,N/A,N/A]  as you can see this device is mapped to address 0B8, when converted from hex to decimal is address 184. If you are using dynamic lun masking (it's default on VMAX) that address 0B8 may not mean anything because it's dynamically masking and uses the next available address for that particular host. I think vSphere and HPUX are the only platforms that show you the actual LUN address that matches your FA address. So i would say use powerpath output or inq utility to keep track of devices.
We have AIX VIO servers connected to VMAX with PowePath multipath s/w installed.We are doing migrations from IBM array to VMAX. When I assign all the VIO Lpar volume group luns to  VIO server all at once from the SMC, how can the AIX admin keep track of which lun goes to which lpar volume group? Does he see any lun ID or device name/logical device id on the AIX server. I know what devices are going to a particular Lpar , does he see the same device id on his system too. I am assuming powermt display dev=all  will give logical device id. Can I ask him to use it as a reference , is there any better alternative.
AIX lun reference