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From: Wilko Bulte <wilko@yedi.iaf.nl>
Message-Id: <199702032116.WAA01317@yedi.iaf.nl>
Subject: Re: DEC TZ87
To: ks@itp.ac.ru (Sergey S. Kosyakov)
Date: Mon, 3 Feb 1997 22:16:52 +0100 (MET)
Cc: hardware@freebsd.org
In-Reply-To: <XFMail.970203171521.ks@itp.ac.ru> from "Sergey S. Kosyakov" at Feb 3, 97 04:55:10 pm
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As Sergey S. Kosyakov wrote...

<< appreciate a way to fix this message below, from elm>>
[Charset: KOI8-R, skipping]

<< Xterm cut'n paste >>
>         Dear Wilko,
> 
> I have "DEC TZ87 (C) DEC 9514 type 1 removable SCSI-2" "density code 0x19"
> tape drive. It works very well with MS WinNT. But with FreeBSD I met some
> problems. If I use tar,dd, or simple "cat big.file > /dev/rst0" command
> fails
> in random time with 
> st0(ncr1:1:0): Deferred Error: RECOVERED ERROR asc:a,0 Error log overflow

My TZ87 manual tells me that the drive has seen an excessive I/O error
rate. The log it refers to  (log pages 2/3) use 4 byte counters
to count the different errors (corrected, fatal etc). It seems your
drive is reporting loads of errors to the system. Maybe NT just 
ignores these?

Questions:

- is it always on the same tape?
- is there a switching power supply in the drives neighbourhood?
  Mine became very upset when the PS transformer induced EMI into the
  head and/or electronics.

> After light hack of st driver I find out that at this time
> sense->error_code equals 113 (decimal). I add to st.c lines
> (into st_interpret_sense(xs) function):
>         if(sense->error_code==113)
>           return ESUCCESS;            
> With that hack the tape seems to work right.

Yikes. I'd rather investigate where the errors come from. Assuming the
SCSI code is OK.

> NCR PCI 53c815 is my SCSI controller. FreeBSD-2.1, 2.2-SNAPs, 2.2-BETA (now)

I have an NRC810. Works fine with 2.1R and 2.1.5R

Did you have problems with all these FreeBSD versions?

Wilko
_     ____________________________________________________________________
 |   / o / /  _  Bulte  email: wilko@yedi.iaf.nl - Arnhem, The Netherlands
 |/|/ / / /( (_) 	Do, or do not. There is no 'try' - Yoda
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