Hi Mike,
You can hot-plug disks on almost all modern Linux Kernel distro's, you just need to initiate a bus rescan (or setup /sbin/hotplug). Here's a script I use to do the job, the device then appears as /dev/sdX where X is the letter after your last disk. i.e. If I had two disks and hot-plugged a third, it would be /dev/sdc. The you just need to fdisk it, use mkfs to format it, mount it, and add an entry to /etc/fstab if you want it auto-mounted on boot.
Hope this helps,
Alex
#!/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. "
