On Sun, Feb 14, 2010 at 8:16 AM, shouldbe q931
<shouldbeq931 AT googlemail DOT com> wrote:
> ooh, found this http://old.nabble.com/Bad-Autochanger-td15870476.html
> and following the advice in the 2nd post from John M. Drescher
>
> ----------------------------------
> If you believe the tape was successfully loaded in a slot then you
> need to customize the mtx-changer script.
>
> Look at the code
>
> #     sleep 15
>      wait_for_drive $device
>      exit $rtn
>      ;;
>
> I would comment out wait_for_drive and replace it with sleep 120. Turn
> on some debugging in the script so you can see what is happening.
> ----------------------------------
> edited mtx-changer, ran autochanger again, and
>
> *autochanger
>
> Ah, I see you have an autochanger configured.
> To test the autochanger you must have a blank tape
>  that I can write on in Slot 1.
>
> Do you wish to continue with the Autochanger test? (y/n): y
>
>
> === Autochanger test ===
>
> 3301 Issuing autochanger "loaded" command.
> Slot 1 loaded. I am going to unload it.
> 3302 Issuing autochanger "unload 1 0" command.
> unload status=OK 0
> 3303 Issuing autochanger "load 1 0" command.
> 3303 Autochanger "load 1 0" status is OK.
> btape: btape.c:476 open device "Certance" (/dev/st0): OK
> btape: btape.c:1562 Rewound "Certance" (/dev/st0)
> btape: btape.c:1569 Wrote EOF to "Certance" (/dev/st0)
>
> The test autochanger worked!!

After that I would verify that the result is reproducible then try to
determine the reason for the failure of the following code:

wait_for_drive() {
  i=0
  while [ $i -le 300 ]; do  # Wait max 300 seconds
    if mt -f $1 status 2>&1 | grep "${ready}" >/dev/null 2>&1; then
      break
    fi
    debug "Device $1 - not ready, retrying..."
    sleep 1
    i=`expr $i + 1`
  done
}

What this does is loops calling mt -f /dev/nst0 status

and looks at the output for "ONLINE". If it finds "ONLINE" anywhere in
the output it exits the loop otherwise it loops for a maximum of 300
seconds.

So the first step in fixing this for your system would be to
mount a volume via the autochanger web interface and
look at the output of
mt -f /dev/nst0 status

Does it output "ONLINE" in anywhere status after a tape is loaded?

John

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