Re: [foxboro] 4MM Tape Problems

Mr. Balmer,

With a tape in the drive, try the following:

  mt -f /dev/rmt/0 status

If this returns a message saying No Tape Loaded or Drive Offline,
change the 0 to 1, then to 2 if nessessary.

If you get the offline message on all 3 devices, and there is a tape
in that drive, you've got a hardware, or addressing problem. If it shows
a valid status on one, the drive is conected and talking.

Now, use the same number, but add the characters 'cb' after it.  This
would be (for device 0) :

  mt -f /dev/rmt/0cb status

If you get an error here, best guess is drive jumpers.

The drive behaviour is described by those letters.  The 'c' means
operate in 'compressed' mode.  The 'b' means 'bsd behaviour'.

The drive commonly is not jumpered for compressed, or ultra compressed,
but the Backup script assumes that it is.

The backup script, in searching for a tape drive, doea that same command
on devices /dev/rmt/0cb, /dev/rmt/1cb, and /dev/rmt/2cb.  It uses the
first to give a favourable responce.

More info on the settings in in the 'man' page mtio; these letters are
described near the end of the text.

Backup doesn't use /dev/rst9 or nrst9.  Instead it uses /dev/rmt/0cb or
/dev/rmt/0cbn, or 1cb/1cbn, or 2cb/2cbn, depending on where the device
is on the SCSI chain. (by the way, the 'n' means do not rewind when done)

William C. Ricker
FeedForward, Inc.
Marietta, GA, USA
wcricker@xxxxxxxxxxxxxxx
770-426-4422 


 
 
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