[daip] Tape loading problems

[g99r1227 at campus.ru.ac.za]

Hi

I have been having some problems loading my data from tape. I have loaded
the same data before without problems, but this time not.

I have been loading the data with FITLD. My data spans 4 DAT tapes which I
use DOCONCAT 1 to concatenate. Tape 1 and 2 load fine, the problem occurs from
Tape 3, file 4. The MSGSRV output from FITLD on Tape 3, file 4, is:
------------

   1    4   24-NOV-2003  18:25:55     FITLD     ---------- FILE   3 LOADED
----------
   1    4   24-NOV-2003  18:25:55     FITLD     UV data will be written in
compressed format
   1    2   24-NOV-2003  18:25:55     FITLD     Create BK018       .FITLD .   3
(UV)  on disk  1  cno    6
   1    6   24-NOV-2003  18:25:55     FITLD     Sky frequencies (MHz) before
re-ordering occurs:
   1    3   24-NOV-2003  18:25:55     FITLD     Incoming FREQID #   1
   1    3   24-NOV-2003  18:25:55     FITLD     43112.74  43116.74  43120.74 
43124.74  
   1    8   24-NOV-2003  18:25:55     FITLD     Warning: table type FL is of
zero length
   1    8   24-NOV-2003  18:25:55     FITLD     Warning: table type MC is of
zero length
   1    3   24-NOV-2003  18:25:55     FITLD     CL table interval set at  0.10
minutes
   1    4   24-NOV-2003  18:25:55     FITLD     Current file has     8680
visibilities
   1    4   24-NOV-2003  18:25:55     FITLD     File ref. freq:    43112.74 MHz
   1    4   24-NOV-2003  18:26:00     FITLD     Found 0420-014         at  
0/06:17:08 src #   1 
   1    4   24-NOV-2003  18:26:00    
FITLD                                            fqid #   1
L      apus       AIPS (31DEC03)       4               24-NOV-2003  
20:22:08               Page   12
Pops  Prior    Date        Time       Task          Messages for user    4
 
   1    4   24-NOV-2003  18:30:27     FITLD     UV table spanned time:  
0/06:17:08 -  0/06:29:53
   1    4   24-NOV-2003  18:30:27     FITLD         8680 vis. written 
   1    8   24-NOV-2003  18:30:28     FITLD     MCSORT: EMPTY IM TABLE
   1    6   24-NOV-2003  18:30:28     FITLD     MCORDR: ERROR   1 FROM MCSORT
OPCODE = SORT
   1    8   24-NOV-2003  18:30:28     FITLD     BT2AIP: ERROR   1 FORMING CL
TABLE FROM CA TABLE
   1    8   24-NOV-2003  18:30:28     FITLD     ERROR      1 RETURNED FROM
BT2AIP  
   1    3   24-NOV-2003  18:30:28     FITLD     Purports to die of UNNATURAL
causes

------------
I attempted to load the data several times, on a couple of occasions the above
output was replaced by:
------------

   1    4   24-NOV-2003  19:07:15     FITLD     ---------- FILE   3 LOADED
---------- 
   1    8   24-NOV-2003  19:07:15     FITLD     MAPCQI: MISSING CQ TABLE ON
DISK:  1 CNO:   6
   1    6   24-NOV-2003  19:07:15     FITLD     IF THIS IS VLBA DATA YOU HAVE A
PROBLEM
   1    6   24-NOV-2003  19:07:15     FITLD     TABINI: REQUESTED FR FILE   2
DOES NOT EXIST
   1    6   24-NOV-2003  19:07:15     FITLD     FRINIT: ERROR   2 FROM TABINI
OPCODE = READ
   1    8   24-NOV-2003  19:07:15     FITLD     FRINI: ERROR INITIALIZING
FREQUENCY TABLE FOR READ   
   1    6   24-NOV-2003  19:07:15     FITLD     FRQORD: ERROR   2 FROM FRINIF
OPCODE = READ
   1    8   24-NOV-2003  19:07:15     FITLD     FRQORD: ERROR   2 FROM FRINIF
OPCODE = READ
   1    8   24-NOV-2003  19:07:15     FITLD     ERROR      2 RETURNED FROM
BTRTAB
   1    8   24-NOV-2003  19:07:15     FITLD     RMEXT: ZDESTR ERROR =  1
L      apus       AIPS (31DEC03)       4               24-NOV-2003  
20:22:08               Page   14
Pops  Prior    Date        Time       Task          Messages for user    4
 
   1    8   24-NOV-2003  19:07:15     FITLD     RMEXT: ZDESTR ERROR =  1
   1    3   24-NOV-2003  19:07:15     FITLD     Purports to die of UNNATURAL
causes

----------
I used NFILES to skip over this file and carry on reading - file 5 on the same
tape read in fine, but file 6 gave the original error messages again. I then
tried Tape 4 and the first file gave error messages.

I looked back to my FITLD logs from when I had loaded the data in in the past
and found that Tape 3, file 3 is the fist file on the four tapes to produce a   
"Warning: table type MC is of zero length" output. Tape 3, file 5 does not have
this warning, while file 6 does. The first file on the fourth tape also produces
this warning.

My data is from December 1994, opcode BK018.

Could you please help?

Thank you!

Regards,
Laura Richter