Hi,

Here's a script modified from various ones found on the Internet :

# cat get_serial.sh

#!/bin/bash

# work with udev for IBM SCSI tape device persistent naming support

SYSFS=/sys

        echo "IBMDEV;SERIAL;WWN" 

for IBMDEV in /dev/IBMtape[0-9]
        do
        DEVPATH=/class/lin_tape/$(basename $IBMDEV)

        NAME=$(echo $DEVPATH|sed -e 's/.*\/\([a-zA-Z]*\)[0-9n]*$/\1/')

        # lin_tape does not have the IOCTL that scsi_id uses however it
        # has a sysfs entry pointing to the generic device which does
        # support that IOCTL
        SYMLINKPATH="$SYSFS$DEVPATH/device/generic"
        if [ ! -d $SYMLINKPATH ] ; then
                exit 1
        fi

        cd $SYMLINKPATH
        GDEVICEPATH="$(pwd -P|sed -e '{ s/\/sys\(.*\)/\1/ }')"
        #
        WWN="$(/sbin/scsi_id -gus $GDEVICEPATH)"
        #
        TAPE_ID="$(/sbin/scsi_id -p 0x80 -gs $GDEVICEPATH)"
        set ${TAPE_ID}
        SERIAL=$3
        #
        echo "${IBMDEV};${SERIAL};${WWN}" | sed -e "s/\/dev\///"

        done
exit 0

Example running on an RHEL 5 (I don't have an RHEL 4 with devices attached, 
here MHVTL)
# sh get_serial.sh
IBMDEV;SERIAL;WWN
IBMtape0;XYZZY_A1;350223344ab000100
IBMtape1;XYZZY_A2;350223344ab000200
IBMtape2;XYZZY_A3;350223344ab000300
IBMtape3;XYZZY_A4;350223344ab000400


-- 
Best regards / Cordialement / مع تحياتي
Erwann SIMON

----- Mail original -----
De: "EJ van Loon - SPLXM" <Eric-van.Loon AT KLM DOT COM>
À: ADSM-L AT VM.MARIST DOT EDU
Envoyé: Mardi 2 Juillet 2013 11:52:43
Objet: [ADSM-L] Question for Linux tape experts

Hi TSM-ers!

I have got a question for Linux experts and specifically expert on tape
drives in Linux.

We've got some problems with lin_tape on Linux. Our Storage Agent
installation scripts use the command cat /proc/scsi/IBMtape to retrieve
the serial information of the tape drives. The problem is that this
causes a panic on some hosts. IBM identified this to be a known bug in
lin_tape 1.66 which has been solved in lin_tape 1.69 and higher,
however, 1.66 is the highest release available for RHEL4 servers...

So, I'm looking for a way to avoid the cat command, but I need a way to
retrieve the drive serials and link them to the Linux tape drive. Does
anyone have an alternative method we can use?

Thank you very much for any help in advance!

Kind regards,

Eric van Loon

AF/KLM Storage Engineering

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