Well, here I leave you a script that I think is very useful for detecting disks without having to restart.
Ruby
#!/bin/bash
# Skript to rescan SCSI bus, using the
# scsi add-single-device mechanism
# (w) 1998-03-19 Kurt Garloff <kurt@garloff.de> (c) GNU GPL
# (w) 2003-07-16 Kurt Garloff <garloff@suse.de> (c) GNU GPL
# $Id: rescan-scsi-bus.sh,v 1.15 2004/05/08 14:47:13 garloff Exp $
setcolor ()
{
red=”\e[0;31m»
green=»\e[0;32m»
yellow=»\e[0;33m»
norm=»\e[0;0m»
}
unsetcolor ()
{
red=»»; green=»»
yellow=»»; norm=»»
}
# Return hosts. sysfs must be mounted
findhosts_26 ()
{
hosts=
if ! ls /sys/class/scsi_host/host* >/dev/null 2>&1; then
echo «No SCSI host adapters found in sysfs»
exit 1;
#hosts=» 0″
#return
fi
for hostdir in /sys/class/scsi_host/host*; do
hostno=${hostdir#/sys/class/scsi_host/host}
hostname=`cat $hostdir/proc_name`
hosts=»$hosts $hostno»
echo «Host adapter $hostno ($hostname) found.»
done
}
# Return hosts. /proc/scsi/HOSTADAPTER/? must exist
findhosts ()
{
hosts=
for driverdir in /proc/scsi/*; do
driver=${driverdir#/proc/scsi/}
if test $driver = scsi -o $driver = sg -o $driver = dummy -o $driver = device_info; then continue; fi
for hostdir in $driverdir/*; do
name=${hostdir#/proc/scsi/*/}
if test $name = add_map -o $name = map -o $name = mod_parm; then continue; fi
num=$name
driverinfo=$driver
if test -r $hostdir/status; then
num=$(printf ‘%d\n’ `sed -n ‘s/SCSI host number://p’ $hostdir/status`)
driverinfo=»$driver:$name»
fi
hosts=»$hosts $num»
echo «Host adapter $num ($driverinfo) found.»
done
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 -n2 | 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 $devnr …»
printf «${yellow}OLD: $norm»
testexist
if test ! -z «$remove» -a ! -z «$new»; then
# Device exists and we’re in remove mode, so remove and readd
echo «scsi remove-single-device $devnr» >/proc/scsi/scsi
echo «scsi add-single-device $devnr» >/proc/scsi/scsi
printf «\r\x1b[A\x1b[A\x1b[A${yellow}OLD: $norm»
testexist
if test -z «$new»; then
printf «\r${red}DEL: $norm\r\n\n\n\n»; let rmvd+=1;
fi
fi
if test -z «$new»; then
# Device does not exist, try to add
printf «\r${green}NEW: $norm»
echo «scsi add-single-device $devnr» >/proc/scsi/scsi
testexist
if test -z «$new»; then
# Device not present
printf «\r\x1b[A»;
# Optimization: if lun==0, stop here (only if in non-remove mode)
if test $lun = 0 -a -z «$remove» -a $optscan = 1; then
break;
fi
else
let found+=1;
fi
fi
done
done
done
}
# main
if test @$1 = @–help -o @$1 = @-h -o @$1 = @-?; then
echo «Usage: rescan-scsi-bus.sh [options] [host [host …]]”
echo “Options:”
echo ” -l activates scanning for LUNs 0-7 [default: 0]”
echo ” -w scan for target device IDs 0 .. 15 [default: 0-7]”
echo ” -c enables scanning of channels 0 1 [default: 0]”
echo ” -r enables removing of devices [default: disabled]”
echo “–remove: same as -r”
echo “–nooptscan: don’t stop looking for LUNs is 0 is not found”
echo “–color: use coloured prefixes OLD/NEW/DEL”
echo “–hosts=LIST: Scan only host(s) in LIST”
echo “–channels=LIST: Scan only channel(s) in LIST”
echo “–ids=LIST: Scan only target ID(s) in LIST”
echo “–luns=LIST: Scan only lun(s) in LIST”
echo ” Host numbers may thus be specified either directly on cmd line (deprecated) or”
echo ” or with the –hosts=LIST parameter (recommended).”
echo “LIST: A[-B][,C[-D]]… is a comma separated list of single values and ranges”
echo ” (No spaces allowed.)”
exit 0
fi
expandlist ()
{
list=$1
result=”»
first=${list%%,*}
rest=${list#*,}
while test ! -z “$first”; do
beg=${first%%-*};
if test “$beg” = “$first”; then
result=”$result $beg”;
else
end=${first#*-}
result=”$result `seq $beg $end`”
fi
test “$rest” = “$first” && rest=”»
first=${rest%%,*}
rest=${rest#*,}
done
echo $result
}
if test ! -d /proc/scsi/; then
echo “Error: SCSI subsystem not active”
exit 1
fi
# defaults
unsetcolor
lunsearch=”0″
idsearch=`seq 0 7`
channelsearch=”0″
remove=”»
optscan=1
if test -d /sys/class/scsi_host; then
findhosts_26
else
findhosts
fi
# Scan options
opt=”$1″
while test ! -z “$opt” -a -z “${opt##-*}”; do
opt=${opt#-}
case “$opt” in
l) lunsearch=`seq 0 7` ;;
w) idsearch=`seq 0 15` ;;
c) channelsearch=”0 1″ ;;
r) remove=1 ;;
-remove) remove=1 ;;
-hosts=*) arg=${opt#-hosts=}; hosts=`expandlist $arg` ;;
-channels=*) arg=${opt#-channels=};channelsearch=`expandlist $arg` ;;
-ids=*) arg=${opt#-ids=}; idsearch=`expandlist $arg` ;;
-luns=*) arg=${opt#-luns=}; lunsearch=`expandlist $arg` ;;
-color) setcolor ;;
-nooptscan) optscan=0 ;;
*) echo “Unknown option -$opt !” ;;
esac
shift
opt=”$1″
done
# Hosts given ?
if test “@$1″ != “@”; then
hosts=$*;
fi
echo “Scanning hosts $hosts channels $channelsearch for ”
echo ” SCSI target IDs ” $idsearch “, LUNs ” $lunsearch
test -z “$remove” || echo ” and remove devices that have disappeared”
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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