[daip] tape probs (fwd)

[Meri Stanley]

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>From dshepher at zia.aoc.NRAO.EDU Thu May 18 08:22 MDT 2000
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Date: Thu, 18 May 2000 08:22:45 -0600 (MDT)
From: Debra Shepherd <dshepher at aoc.nrao.edu>
To: Meri Stanley <mstanley at zia.aoc.NRAO.EDU>
cc: Debra Shepherd <dshepher at zia.aoc.NRAO.EDU>
Subject: tape probs (fwd)
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Hi Meri, 

Ka Chun Yu (the visitor on tesuque a couple of weeks ago) is having tape
read problems with his calibrated OH line data.  Do you have any
suggestions about how to solve this problem?  His e-mail to me about the
problems he has been having is appended below.  

Thanks for your help!

Debra

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Date: Wed, 17 May 2000 20:05:08 -0600 (MDT)
From: Ka Chun Yu <kachun at casa.colorado.edu>
To: Debra Shepherd <dshepher at zia.aoc.NRAO.EDU>
Subject: tape probs

Hi Deb,

I thought I had a successful read but then the stupid tape drive craps
out on me again...

I manage to load ch0sav and linsav (the saved tables for channel 0
and the line data), then the ch0nrf (no RF channel 0) data, all quite
successfully.  Then FITLD automatically went onto the final file, the
line data set which is enormous--about 1 GB.  I go away and come back
to find:

  FITLD1: Create 20000430    .LINE  .   1 (UV)  on disk  4  cno    6
  FITLD1: TAPIO: RECORD LENGTH  24318 INCONSISTENT WITH BLOCK SIZE  2880
  FITLD1: UVFDAT: ERROR READING TAPE. IERR=    10
  FITLD1: ERROR     10 RETURNED FROM UVFDAT
  FITLD1: ZTPWAT: ERROR   6 FOR LUN = 31 IBUFF = 2 TO TAPE
  FITLD1: ZERROR: IN ZTPWA2 ERRNO = 5 (I/O error)
  FITLD1: ZERROR: IN ZTPWA2 ERRNO = 5 (I/O error)
  FITLD1: This usually means you're at END-OF-TAPE
  FITLD1: TAPIO: ERROR  6 DOING I/O WITH OPCODE = CLOS
  FITLD1: ZCLOSE: DOES NOT PERFORM TAPE CLOSES AS OF 15APR87
  FITLD1: Destroyed  1 extension files of type HI
  FITLD1: Destroyed UV image file: catno=      6 disk= 4
  FITLD1: Purports to die of UNNATURAL causes
  FITLD1: skipper      15OCT99 TST: Cpu=     102.3  Real=    8962
   Note: IEEE floating-point exception traps enabled: 
      overflow;  division by zero;  invalid operation; 
   Nonstandard floating-point mode enabled 
   See the Numerical Computation Guide, ieee_handler(3M), ieee_sun(3M) 

After all this effort and after this error, aips has helpfully
deleted the three previous files on disk (ch0sav, linsav, ch0nrf)
which I thought I had successfully loaded in addition to the line
data set.  For this FITLD attempt, I had set NCOUNT to 4 instead of
1000, which almost worked for the first three files.  However the
final error messages above look like the previous set of error
messages for the other tape.  Maybe I should try an abort in the
middle of the FITLD on the 4th file (line data) and try to read it
with a separate FITLD call?

The three possibilites for what is wrong are: (1) the way aips is set
up here is screwy (software problem); (2) the tape drive is just not
cooperating with aips (hardware problem); (3) or the tapes weren't
written properly at the AOC.  Any ideas from your end?


--kachun  +**  Center for Astrophysics and Space Astronomy, CB 389  **+
          +**    University of Colorado, Boulder, CO 80309          **+
          +**  Email: kachun at casa.colorado.edu                      **+
          +**  http://casa.colorado.edu/~kachun                     **+



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