背景：当设备支持2个及两个以上硬盘插槽时（这里举例有两个硬盘插槽C0和C1），用户无法判断哪个硬盘插槽是hda，哪个是hdb，因为内核检测机制是哪个硬盘先被扫描到，哪个就认为是hda。通过修改hotplug脚本，可以实现固定硬盘插槽，比如C0对应hda，C1对应hdb。
脚本实例：
#一个是disk，表示设备本身，对应的$DEVPATH $MAJOR $MINOR分别是/block/hda0: 8 0#一个是partition，表示设备上的分区，对应的$DEVPATH $MAJOR $MINOR分别是 /block/sda/hda0: 8 1#硬盘插入：if [ $ACTION == "add" ];thenif ( echo $DEVPATH | grep "/block/sd" > /dev/null 2>&1 ) && [ $DEVTYPE == "partition" ]; thenfor i in a b c d e fdoif ( echo $DEVPATH | grep "/block/sd""$i""" > /dev/null 2>&1 ) thenif ( readlink -f /sys/block/sd"$i"/device/ | grep "host0" > /dev/null 2>&1) thenDEVPATH="/block/sda/hda0:"/sbin/hotplug_innerecho "notice!!!! $DEVTYPE $DEVPATH $MAJOR $MINOR not process" >> /var/log/hotplug.logbreakelif ( readlink -f /sys/block/sd"$i"/device/ | grep "host1" > /dev/null 2>&1 ) thenDEVPATH="/block/sda/hdb0:"/sbin/hotplug_innerecho "notice!!!! action=$ACTION $DEVTYPE $DEVPATH $MAJOR $MINOR not process" >> /var/log/hotplug.logbreakfifidoneelif ( echo $DEVPATH | grep "/block/hd" > /dev/null 2>&1 ) && [ $DEVTYPE == "disk" ]; thenfor i in a b c d e fdoif ( echo $DEVPATH | grep "/block/hd""$i""" > /dev/null 2>&1 ) thenif ( readlink -f /sys/block/sd"$i"/device/ | grep "host0" > /dev/null 2>&1) thenDEVPATH="/block/hda0:"/sbin/hotplug_innerecho "notice!!!! action=$ACTION $DEVTYPE $DEVPATH $MAJOR $MINOR not process" >> /var/log/hotplug.logbreakelif ( readlink -f /sys/block/sd"$i"/device/ | grep "host1" > /dev/null 2>&1) thenDEVPATH="/block/hdb0:"/sbin/hotplug_innerecho "notice!!!! action=$ACTION $DEVTYPE $DEVPATH $MAJOR $MINOR not process" >> /var/log/hotplug.logbreakfifidonefifi#硬盘拔出if [ $ACTION == "remove" ];thenif ( echo $DEVPATH | grep "/block/sd" > /dev/null 2>&1 ) && [ $DEVTYPE == "partition" ]; thenfor i in a b dop=$(ls -l /dev/hd"$i"0: | awk '{print $5}' | sed 's/,//g')q=$(ls -l /dev/hd"$i"0: | awk '{print $6}')if [[ $MAJOR == $p && $MINOR == $q ]]; thenDEVPATH="/block/sd"$i"/hd"$i"0:"#/sbin/hotplug_innerecho "notice!!!! p=$p q=$q action=$ACTION $DEVTYPE $DEVPATH $MAJOR $MINOR not process" >> /var/log/hotplug.logbreakfidoneelif ( echo $DEVPATH | grep "/block/hd" > /dev/null 2>&1 ) && [ $DEVTYPE == "disk" ]; thenfor i in a b do#输出结果的第5列内容，并将逗号去掉（注意print $x ，x从1开始数）p=$(ls -l /dev/hd"$i": | awk '{print $5}' | sed 's/,//g')#输出结果的第6列内容q=$(ls -l /dev/hd"$i": | awk '{print $6}')if [[ $MAJOR == $p && $MINOR == $q ]]; thenDEVPATH="/block/hd"$i"0:"#/sbin/hotplug_innerecho "notice!!!! p=$p q=$q action=$ACTION $DEVTYPE $DEVPATH $MAJOR $MINOR not process" >> /var/log/hotplug.logbreakfidonefifi