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Using CLUE to Obtain Historical Information About Crash Dumps (VAX Only)  



On VAX systems, the Crash Log Utility Extractor (CLUE) displays the contents of a crash history file. By examining the contents of the crash history file, you can understand and resolve the issues responsible for failures (crashes), and you might also obtain other useful data.

Understanding CLUE (VAX Only)  

The crash history file, which is created and updated by CLUE, contains key parameters from crash dump files. Unlike crash dumps, which are overwritten with each system failure and are therefore typically available only for the most recent failure, the crash history file is a permanent record of system failures.

After a system fails and physical memory is copied to the crash dump file, CLUE automatically appends the relevant parameters to the file CLUE$OUTPUT:CLUE$HISTORY.DATA when the system is restarted. The remainder of this section describes how you can use CLUE to display the data it has collected; reference information about CLUE is available in the HP OpenVMS System Management Utilities Reference Manual.


NoteThe history file typically grows by about 10 to 15 blocks for each entry. You can limit the number of entries in the binary file by defining the logical name CLUE$MAX_ENTRIES to be the maximum number desired. When this number is reached, the oldest entries are deleted from the history file.

By default, operator shutdowns are recorded in the history file. You can exclude information from operator shutdowns in the history file by defining the logical name CLUE$EXCLUDE_OPERS as being TRUE, for example by including the following line in SYS$MANAGER:SYSTARTUP_VMS.COM:

$ DEFINE /SYSTEM CLUE$EXCLUDE_OPERS TRUE

Displaying Data Using CLUE (VAX Only)  

To display data using CLUE, you must first define the following symbol:

$ CLUE :== $CLUE
After defining the symbol, you can use CLUE to display information by entering the following command:
$ CLUE/DISPLAY
CLUE_DISPLAY> 
At the CLUE_DISPLAY> prompt, you can issue commands to perform the following actions:

For more information about CLUE commands, refer to the HP OpenVMS System Management Utilities Reference Manual: A--L.


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