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_at_ska.com (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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| (-: Don't anthropomorphize computers. They don't like it. :-) |
|--------------------------------------------------------------------------|
| Renaud KERIVEN /\ CERMICS - Ecole Nationale |
| email: keriven_at_cermics.enpc.fr /__\ des Ponts et Chaussees |
| tel : 33 1 49.14.36.64 /\ /\ La Courtine |
| fax : 33 1 49.14.35.86 /__\/__\ F-93167 Noisy-le-Grand (FRANCE) |
| www : http://cermics.enpc.fr/~keriven/home.html |
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Received on Mon Apr 01 1996 - 10:17:10 NZST