Re: problems with tape drive

[David Tonhofer <d.tonhofer@xxxxxxxxxxx>]

Dana Holland wrote:
> This is what's showing in /proc/scsi/scsi - the device with Id: 06 
> used to say Seagate DAT-72, so I've obviously changed something in my 
> attempts to fix this.

You mean to say that there is no entry?

Try scanning the SCSI bus with this little script (just run it as 
scan_scsi_bush.sh)



#!/bin/bash
# Skript to rescan SCSI bus, using the
# scsi add-single-device mechanism
# (w) 98/03/19 Kurt Garloff <kurt@xxxxxxxxxx> (c) GNU GPL

# Return hosts. /proc/scsi/HOSTADAPTER/? must exist
findhosts ()
{
 hosts=
 for name in /proc/scsi/*/?; do
   name=${name#/proc/scsi/}
   if test ! $name = scsi
     then hosts="$hosts ${name#*/}"
     echo "Host adapter ${name#*/} (${name%/*}) found."
   fi
 done
}

# Test if SCSI device $host $channen $id $lun exists
# Outputs description from /proc/scsi/scsi, returns new
testexist ()
{
 grepstr="scsi$host Channel: 0$channel Id: 0*$id Lun: 0$lun"
 new=`cat /proc/scsi/scsi|grep -e"$grepstr"`
 if test ! -z "$new"
   then cat /proc/scsi/scsi|grep -e"$grepstr"
   cat /proc/scsi/scsi|grep -A2 -e"$grepstr"|tail -2|pr -o4 -l1
 fi
}

# Perform search (scan $host)
dosearch ()
{
 for channel in $channelsearch; do
   for id in $idsearch; do
     for lun in $lunsearch; do
       new=
       devnr="$host $channel $id $lun"
       echo "Scanning for device $devnr ..."
       printf "OLD: "
       testexist
       if test ! -z "$remove" -a ! -z "$new"
         then echo "scsi remove-single-device $devnr" >/proc/scsi/scsi
         echo "scsi add-single-device $devnr" >/proc/scsi/scsi
         printf "\r\x1b[A\x1b[A\x1b[AOLD: "
         testexist
         if test -z "$new"; then printf "\rDEL: \r\n\n\n\n"; let 
rmvd+=1; fi
       fi
       if test -z "$new"
         then printf "\rNEW: "
         echo "scsi add-single-device $devnr" >/proc/scsi/scsi
         testexist
         if test -z "$new"; then printf "\r\x1b[A"; else let found+=1; fi
       fi
     done
   done
 done
}


# main
if test @$1 = @--help -o @$1 = @-h
 then
   echo "Usage: scan_scsi_bus.sh [-l] [-w] [-c] [host [host ...]]"
   echo " -l activates scanning for LUNs 0 .. 7 [default: 0]"
   echo " -w enables scanning for device IDs 0 .. 15 [def.: 0 .. 7]"
   echo " -r enables removing of devices        [default: disabled]"
   echo " -c enables scanning of channels 0 1   [default: 0]"
   echo " If hosts are given, only these are scanned [default: all]"
   exit 0
fi

# defaults
lunsearch="0"
idsearch="0 1 2 3 4 5 6 7"
channelsearch="0"
remove=""

# Scan options
opt="$1"
while test ! -z "$opt" -a -z "${opt##-*}"; do
 opt=${opt#-}
 case "$opt" in
   l) lunsearch="0 1 2 3 4 5 6 7" ;;
   w) idsearch="0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15" ;;
   c) channelsearch="0 1" ;;
   r) remove=1 ;;
   *) echo "Unknown option -$opt !" ;;
 esac
 shift
 opt="$1"
done

# Hosts given ?
if test @$1 = @; then findhosts; else hosts=$*; fi

declare -i found=0
declare -i rmvd=0
for host in $hosts; do dosearch; done
echo "$found new device(s) found.               "
echo "$rmvd device(s) removed.                 "



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