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List:       hpux-devtools
Subject:    HPUX-DEVTOOLS: Oddity with a DLT drive on 11i
From:       Stan Sieler <sieler () allegro ! com>
Date:       2007-03-21 18:36:32
Message-ID: 20070321183632.28FD25251FA () opus ! allegro ! com
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hi,

One of our clients is having a problem reading data from
a DLT drive with one of our products, running on 11i (11.11, PA-RISC).

It's a new DLT drive, and it sure looks like for every read() call
we get what we should get and then a spurious EOF.  

I.e., if we expect:   data, data, EOF, data, data
(from 5 calls to read())
then we see:  data, EOF, data, EOF, EOF, EOF, data, EOF, data, EOF
(from 10 calls to read())

Taking a single tape into consideration...

We know the tape has hundreds of files ... verified by reading it
on an HP 3000 (MPE/iX).
(a "file" here means one or more data records followed by an EOF) 

But, we "see" only one file (because our software stops at the first
double EOF).

"dd" also stops early:

> sys42:/ # dd if=/dev/rmt/c45t5d0BEST of=curtis files=10
> 4+2 records in
> 4+1 records out

Unfortunately, we know that the first file has about 4 blocks, 
so the above tells us that dd only processed one file.


Any suggestions appreciated!


Various data (mt status, lssf,  ioscan, ioscan -fnC) follows...

mt status:      (after the "dd")

 sys42:/ # mt -t /dev/rmt/c45t5d0BEST status
 Drive:  QUANTUM DLT8000
 Format:
 Status: [41118985] BOT online compression immediate-report-mode
 File:   0
 Block:  0

An lssf shows the device is claimed:

 sys42:/ # lssf /dev/rmt/c45*
 stape card instance 45 SCSI target 5 SCSI LUN 0 at&t best density
 available at address 1/0/10/1/0.5.0 /dev/rmt/c45t5d0BEST
 stape card instance 45 SCSI target 5 SCSI LUN 0 berkeley best density
 available at address 1/0/10/1/0.5.0 /dev/rmt/c45t5d0BESTb
 stape card instance 45 SCSI target 5 SCSI LUN 0 at&t no rewind best
 density available at address 1/0/10/1/0.5.0 /dev/rmt/c45t5d0BESTn
 stape card instance 45 SCSI target 5 SCSI LUN 0 berkeley no rewind best
 density available at address 1/0/10/1/0.5.0 /dev/rmt/c45t5d0BESTnb

 (first one above)

sys42:/ # ioscan     (subset)

H/W Path        Class                                    Description
====================================================================
                root
1               cell
1/0                 ioa                                  System Bus Adapter (805)
1/0/10                 ba                                Local PCI-X Bus Adapter \
(783) 1/0/10/1/0                   ext_bus                     SCSI Ultra320 \
A6961-60011 1/0/10/1/0.5                    target
1/0/10/1/0.5.0                     tape                  QUANTUM DLT8000


sys42:/ # ls -l /dev/rmt     (subset)
crw-rw-rw-   2 bin        bin        205 0x023000 Jan  6  2006 18m
crw-rw-rw-   1 bin        bin         99 0x1b0000 Mar  4 09:34 1m
crw-rw-rw-   1 bin        bin        205 0x2b9000 Feb 20 14:23 22m
crw-rw-rw-   2 bin        bin        205 0x023000 Jan  6  2006 c2t3d0BEST
crw-rw-rw-   1 bin        bin        205 0x023001 Jan  6  2006 c2t3d0DDS
crw-rw-rw-   1 bin        bin         99 0x1e0000 Mar  4 09:34 c30t0d0BEST
crw-rw-rw-   1 bin        bin         99 0x1f0000 Mar  4 09:34 c31t0d0BEST
crw-rw-rw-   1 bin        bin         99 0x200000 Mar  4 09:34 c32t0d0BEST
crw-rw-rw-   1 bin        bin         99 0x22f000 Mar  4 09:34 c34t15d0BEST
crw-rw-rw-   1 bin        bin         99 0x230000 Mar  4 09:34 c35t0d0BEST
crw-rw-rw-   1 bin        bin        205 0x2d5000 Mar  4 09:57 c45t5d0BEST     

   The last one above is the DLT drive in question.

sys42:/ # ioscan -fnC tape     (subset)
Class     I  H/W Path        Driver   S/W State   H/W Type
Description
========================================================================================================================
 tape     18  1/0/1/1/0/1/0.3.0          stape    CLAIMED     DEVICE HP      C5683A
                            /dev/rmt/18m           /dev/rmt/18mnb

tape      8  1/0/6/1/0.1.6.255.0.0.0    atdd     CLAIMED     DEVICE IBM     \
ULT3580-TD2  /dev/rmt/8m            /dev/rmt/8mn

tape     22  1/0/10/1/0.5.0  stape    CLAIMED     DEVICE       QUANTUM DLT8000
                            /dev/rmt/c45t5d0BEST /dev/rmt/c45t5d0BESTb   \
/dev/rmt/c45t5d0BESTn   /dev/rmt/c45t5d0BESTnb \
========================================================================


thanks,

-- 
Stan Sieler
work:     www.allegro.com
personal: www.sieler.com/wanted/index.html  

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