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SubjectRe: 2.2.18 IDE tape problem, with ide-scsi
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Greetings!  OK, with st debugging, here are the most common errors
with the Conner:

Feb 27 14:46:39 intech9 kernel: st0: Error: 28000000, cmd: 8 1 0 0 40 0 Len: 16
Feb 27 14:46:39 intech9 kernel: Info fld=0x24, Current st09:00: sns = f0 8
Feb 27 14:46:39 intech9 kernel: ASC=14 ASCQ= 3
Feb 27 14:46:39 intech9 kernel: Raw sense data:0xf0 0x00 0x08 0x00 0x00 0x00 0x24 0x0a 0x00 0x00 0x00 0x00 0x14 0x03 0x00 0x00
Feb 27 14:46:39 intech9 kernel: st0: Sense: f0 0 8 0 0 0 24 a
Feb 27 14:46:39 intech9 kernel: st0: Tape error while reading.
Feb 27 14:46:40 intech9 kernel: st0: Error: 28000000, cmd: 5 0 0 0 0 0 Len: 16
Feb 27 14:46:40 intech9 kernel: [valid=0] Info fld=0x0, Current st09:00: sns = 70 5
Feb 27 14:46:40 intech9 kernel: ASC=20 ASCQ= 0
Feb 27 14:46:40 intech9 kernel: Raw sense data:0x70 0x00 0x05 0x00 0x00 0x00 0x00 0x0a 0x00 0x00 0x00 0x00 0x20 0x00 0x00 0x00
Feb 27 14:46:40 intech9 kernel: st0: Can't read block limits.
Feb 27 14:46:40 intech9 kernel: st0: Mode sense. Length 11, medium b6, WBS 10, BLL 8
Feb 27 14:46:40 intech9 kernel: st0: Density 45, tape length: 0, drv buffer: 1
Feb 27 14:46:40 intech9 kernel: st0: Block size: 512, buffer size: 32768 (64 blocks).


Any advice appreciated!

Khalid Aziz <khalid@fc.hp.com> writes:

> Camm Maguire wrote:
> >
> > Thanks for the error identification. The other drive is of a
> > *different* model. This drive showed this behavior from the day I
> > bought it. The drive could be going bad, but I doubt it. Is it
> > possible that this manufacturer (Conner) has some peculiar
> > implementation of the spec? I recall reading on this list sometime
> > back of similar workarounds to unusual drives.
>
> Since the non-wroking drive is a different model, other drive working
> does not mean the st driver is sending only valid commands to the
> drives. st driver is sending a command to this drive which the drive
> does not like. It will help to know what that command is.
>
> >
> > > st driver prints the SCSI command that may have caused this error only
> > > when compiled with debug turned on. Maybe st driver should always print
> > > the command that results in a check condition as long as the command is
> > > not a Test Unit Ready or Mode Sense.
> > >
> >
> > Can I turn on debug mode in runtime, or do I need to recompile
> > ide-scsi?
>
> This is a compile time option, so you will have to recompile "st"
> driver. If you look at drivers/scsi/st.c, near the top of the file (line
> 44 for 2.4.2) you will see a line
>
> #define DEBUG 0
>
> Change this line to set DEBUG to 1 and recompile. This may generate lot
> of messages from Test Unit Ready and Mode Sense commands. You can
> suppress these messages by replacing the code block within "if
> (debugging)" conditional at line 241 with following:
>
> if (SRpnt->sr_cmnd[0] != MODE_SENSE &&
> SRpnt->sr_cmnd[0] != TEST_UNIT_READY) {
> printk(ST_DEB_MSG "st%d: Error: %x, cmd: %x %x %x %x %x
> %x Len: %d\n",
> dev, result,
> SRpnt->sr_cmnd[0], SRpnt->sr_cmnd[1],
> SRpnt->sr_cmnd[2],
> SRpnt->sr_cmnd[3], SRpnt->sr_cmnd[4],
> SRpnt->sr_cmnd[5],
> SRpnt->sr_bufflen);
> if (driver_byte(result) & DRIVER_SENSE)
> print_req_sense("st", SRpnt);
> }
>
>
> ====================================================================
> Khalid Aziz Linux Development Laboratory
> (970)898-9214 Hewlett-Packard
> khalid@fc.hp.com Fort Collins, CO
>
>

--
Camm Maguire camm@enhanced.com
==========================================================================
"The earth is but one country, and mankind its citizens." -- Baha'u'llah
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