RTE-A Crash Dump Procedure
  
  
PROBLEM TEXT
  
My RTE-A system has been hanging or halting intermittently. I would like to
know how to get started with the ACDA Crash Dump Analyzer. What are the
steps involved?
  
DETAIL TEXT
  
RTE-A all revisions.
  
RESOLUTION TEXT
  
ACDA, the RTE-A Crash Dump Analyzer, will only run on a CDS (VC+) A-series
computer. It requires about 60 pages of code and 25 pages of data segment.
The Analyzer requires two files: a Snap file and a memory (crash) dump
file. The Snap file can be obtained before or after the crash, using a
standard utility (TF, FST, CO). The crash dump file is obtained immediately
following the crash by using the VCP command %W to copy the contents of
memory to a magtape or CTD.
 
Make sure you know how much memory is installed in the computer.
WH, PA can be used to determine this.  The last section of
memory will be listed, with the ending page number.  Take the
last page number, add 1 and divide by 32, this will be the number
used in step 5 below. For example, if your last page is 1919:
 
   1919 + 1 = 1920/32 = 60 Decimal (74 Octal)
 
 
If you are sending in the crash dump to be analyzed, please send the
following:
 
     - The dump itself
     - The SNAP file and the generation LIST and ANSWER file
     - All registers, including the mapping register 0 (RM0)
 
 
Dumping Memory to tape:
 
     1)  Hit <break> (if the computer isn't halted already)
 
     2)  Copy down all registers (A, B, X, Y, RW, P,RM0)
 
     3)  Set RW to 0
 
     4)  Set M to 0
 
     5)  Set T to the number of 32K word chunks of memory in OCTAL
         (for example: if the CPU contains 1024K bytes of memory, you
         convert to words (= 512K) then divide by 32K (= 16) and convert
         to octal (= 20).)
 
     6)  Set M to 1
 
     7)  Set T to 0
 
     8)  Enter the VCP command %WDCxxxx for CTD
               eg.  %WDC2127   for 7914 CTD tape at HPIB address 2, SC=27B
 
         or %WMTxxxx   for Magtape ( Use a 2400' reel)
 
               eg.  %WMT3026   for 797X tape drive at HPIB address 3, SC=26B
 
     9)  Dumped memory will be copied to the tape
         Note: the tape must be error free, or a LDER ERR 523 will occur.
 
    10)  The crash dump tape may now be copied onto the system used for
         testing. Use a CI COpy or FMGR ST command to copy the crash dump
         tape for a magtape. For a CTD, use the DCOPY utility. The format
         is:
 
         CI> DCOPY,dump_device_LU,dump_device_id,no_of_pages,dump_file
 
Running ACDA
 
The run string for ACDA is:
 
        CI> ACDA snap_filename crash_dump_filename [filelu]  [ N ]
 
where   filelu is the filename or LU to output all of the introductory system
        information prior to command mode.
 
        N is for No Analysis to be done (ie. for a really corrupted system)
 
After the Analyzer performs the preliminary checks, the user  has the
opportunity of using command mode to look at various tables or configurations
on the system. Many commands are available within ACDA. To list all the
commands available, simply type ? ?? or H[elp].
 
HPONLY TEXT
 
For additional information regarding the use of ACDA, see the Crash Dump
Analyzer Reference Manual in the HP 1000 Support Service Kit Documentation,
(part number  24999-90018).
 
KEYWORDS LIST
 
CRASH DUMP
MEMORY ANALYZER
ACDA DCOPY