AIX Crashed..

My AIX 5.3 Machine Carshed

Can any one tell some way to find out what went wrong..

I mean debug why it got creahed...

Did you try errpt, most likely a missing patch issue ...

The Out put of errpt during the crash time...

Description
SYSTEM DUMP

Probable Causes
UNEXPECTED SYSTEM HALT

User Causes
SYSTEM DUMP REQUESTED BY USER

    Recommended Actions
    PERFORM PROBLEM DETERMINATION PROCEDURES

Failure Causes
UNEXPECTED SYSTEM HALT

    Recommended Actions
    PERFORM PROBLEM DETERMINATION PROCEDURES

Detail Data
DUMP DEVICE
/dev/hd6
DUMP SIZE
536870400
TIME
Wed Jul 11 08:27:34 2007
DUMP TYPE (1 = PRIMARY, 2 = SECONDARY)
0
DUMP STATUS
-2
ERROR CODE
0
DUMP INTEGRITY
Compressed dump - Run dmpfmt with -c flag on dum
p after uncompressing.
FILE NAME
/var/adm/ras/vmcore.3.Z
PROCESSOR ID
0

I have tried uncompressing var/adm/ras/vmcore.3.Z

but dmpfmt command is not found on my machine...

You can open a case with IBM. They will ask you to submit your dump file. Here are the steps to get it: