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SUMM: HP C1553A DDS-2 autoloader


Here were my questions

     > It would be great I one of you could help me solve one of these two
     > problems. 

     > 1- I'm using a HP C1553A DDS-2 autoloader under Digital Unix 3.2D. As I
     >    previously read it here, it is possible to control compression just
     >    adding this definition to /sys/data/cam_data.c:
     > /* HP C1553A - RDAT drive */
     > {"HP      C1553A", 14, DEV_TZRDAT, (ALL_DTYPE_SEQUENTIAL <<
     > DTYPE_SHFT) | 
     >   SZ_RDAT_CLASS,
     >   (struct pt_info *)ccmn_null_sizes, SZ_NO_BLK, (DEC_MAX_REC - 1),
     >   &tlz06_dens, NO_MODE_TAB, SZ_NO_FLAGS,
     >   NO_OPT_CMDS, SZ_READY_DEF, SZ_NO_QUE, DD_REQSNS_VAL | DD_INQ_VAL,
     >   43, 64
     > },
     >   Actually:
     >   - the loader seems to be recognized (mt returns TZRDAT, not TZxx) 
     >   - rmt0l doesn't turn compression off
     >   - rmt0h causes an IO write error
     >   PS: underside switches are configured for compression enabled with
     >   host 
     >       control (when I try "compression disabled with host control",
     >       rmt0l 
     >       keeps compression off and rmt0h still causes an IO write error)

     > 2- My second problem is more general: as the head becomes dirty in the
     >    middle of a dump, it happens that the dump aborts
     >    with a write error. It that case, the DAT tape seems to be definitely
     >    unusable: loading such a tape leads to one or two retensions and an
     >    error, as if some important mark had been erased at the beginning
     >    of it. 
     >    Moreover, I have a similar problem with 120m tapes I've formerly
     >    used in 
     >    an old DAT    drive: in the old drive, they were recognized as
     >    DDS 60m 
     >    tapes. In the    1553A, I can't get them recognized back as DDS-2
     >    120m 
     >    ones.  
     >    Any idea to recover those tapes?

I've only got one answer to my first question from
Jonathan.Buchanan@xxxxxxx (thanx again). He was in fact interested in
getting the switch settings. Here they are: 

1-2: on  on  -> compression enabled, host control
     on  off -> comp. enabled. No host control
     off off -> comp. disabled. No host control
     off on  -> comnp. disabled. Host control
  3: on  -> Media recognition system disabled
     off -> MDR active.

4-8: ?. Default on.

Nothing about the second question, except than Jonathan have the same
problem with his tapes.

Any other HP 1553 user?

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| Renaud KERIVEN                   /\     CERMICS - Ecole Nationale        |
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