この linuxrc ファイルは次の節で示すシャットダウンスクリプトと組み合わ せれば正しく動作します．
---------------------- linuxrc --------------------
#!/bin/sh
# ver 1.07 2-12-98
# linuxrc - for raid1 using small dos partition and loadlin
#
# mount the proc file system
/bin/mount /proc
# This may vary for your system.
# Mount the dos partitions, try both
# in case one disk is dead
/bin/mount /dosa
/bin/mount /dosc
# Set a flag in case the raid status file is not found
# then check both drives for the status file
RAIDOWN="raidstat.ro not found"
/bin/echo "Reading md0 shutdown status."
if [ -f /dosa/raidboot/raidstat.ro ]; then
RAIDOWN=`/bin/cat /dosa/raidboot/raidstat.ro`
RAIDREF=`/bin/cat /dosc/raidboot/raidgood.ref`
else
if [ -f /dosc/raidboot/raidstat.ro ]; then
RAIDOWN=`/bin/cat /dosc/raidboot/raidstat.ro`
RAIDREF=`/bin/cat /dosc/raidboot/raidgood.ref`
fi
fi
# Test for a clean shutdown with all disks operational
if [ "${RAIDOWN} != ${RAIDREF}" ]; then
echo "ERROR ${RAIDOWN}"
# Use the next 2 lines to BAIL OUT and leave rescue running
/bin/echo 0x100>/proc/sys/kernel/real-root-dev
exit # leaving the error files in dosa/raidboot,etc...
fi
# The raid array is clean, proceed by removing
# status file and writing a clean superblock
/bin/rm /dosa/raidboot/raidstat.ro
/bin/rm /dosc/raidboot/raidstat.ro
/sbin/mkraid /etc/raid1.conf -f --only-superblock
/bin/umount /dosa
/bin/umount /dosc
# Mount raid array
echo "Mounting md0, root filesystem"
/sbin/mdadd -ar
# If there are errors - BAIL OUT and leave rescue running
if [ $? -ne 0 ]; then
echo "RAID device has errors"
# Use the next 3 lines to BAIL OUT
/bin/rm /etc/mtab # remove bad mtab
/bin/echo 0x100>/proc/sys/kernel/real-root-dev
exit
fi
# else tell the kernel to switch to /dev/md0 as the /root device
# The 0x900 value the device number calculated by:
# 256*major_device_number + minor_device number
/bin/echo 0x900>/proc/sys/kernel/real-root-dev
# umount /proc to deallocate initrd device ram space
/bin/umount /proc
/bin/echo "/dev/md0 mounted as root"
exit
#------------------ end linuxrc ----------------------
このシャットダウンスクリプトは前に示した linuxrc と組み合わせれば 正しく動作します．
RAID アレイのシャットダウン時のステータスを得るために，ファイルシステ ムをアンマウントする直前に以下の行を挿入します．
RAIDSTATUS=`/bin/cat /proc/mdstat | /usr/bin/grep md0`
全てのファイルシステムをアンマウントした後(ルートファイルシステムはア
ンマウント「されません」)の部分に，以下を追加します．
# root device remains mounted RO
# mount dos file systems RW
mount -n -o remount,ro /
echo "Writing RAID read-only boot FLAG(s)."
mount -n /dosa
mount -n /dosc
# create raid mounted RO flag in duplicate
# containing the shutdown status of the raid array
echo ${RAIDSTATUS} > /dosa/raidboot/raidstat.ro
echo ${RAIDSTATUS} > /dosc/raidboot/raidstat.ro
umount -n /dosa
umount -n /dosc
# Stop all the raid arrays (except root)
echo "Stopping raid"
mdstop -a
これによって，ルート以外の全ての RAID デバイスが正常に終了します．ルー
トのステータスは raidstat.ro に保存され，次回の起動時に参照されま
す．
筆者が以前に RAID1 の Slackware システムで使っていたシャットダウンスク リプトの全体を以下に示します．筆者は RAID1 から /etc/raidboot.conf ファ イルを使う新しい方法に乗り換えています．
#! /bin/sh
#
# rc.6 This file is executed by init when it goes into runlevel
# 0 (halt) or runlevel 6 (reboot). It kills all processes,
# unmounts file systems and then either halts or reboots.
#
# Version: @(#)/etc/rc.d/rc.6 1.50 1994-01-15
#
# Author: Miquel van Smoorenburg <miquels@drinkel.nl.mugnet.org>
# Modified by: Patrick J. Volkerding, <volkerdi@ftp.cdrom.com>
# Modified by: Michael A. Robinton, <michael@bzs.org> for RAID shutdown
# Set the path.
PATH=/sbin:/etc:/bin:/usr/bin
# Set linefeed mode to avoid staircase effect.
stty onlcr
echo "Running shutdown script $0:"
# Find out how we were called.
case "$0" in
*0)
message="The system is halted."
command="halt"
;;
*6)
message="Rebooting."
command=reboot
;;
*)
echo "$0: call me as \"rc.0\" or \"rc.6\" please!"
exit 1
;;
esac
# Kill all processes.
# INIT is supposed to handle this entirely now, but this didn't always
# work correctly without this second pass at killing off the processes.
# Since INIT already notified the user that processes were being killed,
# we'll avoid echoing this info this time around.
if [ "$1" != "fast" ]; then # shutdown did not already kill all processes
killall5 -15
killall5 -9
fi
# Try to turn off quota and accounting.
if [ -x /usr/sbin/quotaoff ]
then
echo "Turning off quota."
/usr/sbin/quotaoff -a
fi
if [ -x /sbin/accton ]
then
echo "Turning off accounting."
/sbin/accton
fi
# Before unmounting file systems write a reboot or halt record to wtmp.
$command -w
# Save localtime
[ -e /usr/lib/zoneinfo/localtime ] && cp /usr/lib/zoneinfo/localtime /etc
# Asynchronously unmount any remote filesystems:
echo "Unmounting remote filesystems."
umount -a -tnfs &
# you must have issued
# 'cat /proc/mdstat | grep md0 > {your boot vol}/raidboot/raidgood.ref'
# before linuxrc will execute properly with this info
RAIDSTATUS=`/bin/cat /proc/mdstat | /usr/bin/grep md0 # capture raid status`
# Turn off swap, then unmount local file systems.
# clearing mdtab as well
echo "Turning off swap."
swapoff -a
echo "Unmounting local file systems."
umount -a -tnonfs
# Don't remount UMSDOS root volumes:
if [ ! "`mount | head -1 | cut -d ' ' -f 5`" = "umsdos" ]; then
mount -n -o remount,ro /
fi
# root device remains mounted
# mount dos file systems RW
echo "Writing RAID read-only boot FLAG(s)."
mount -n /dosa
mount -n /dosc
# create raid mounted RO flag in duplicate
# containing the shutdown status of the raid array
echo ${RAIDSTATUS} > /dosa/raidboot/raidstat.ro
echo ${RAIDSTATUS} > /dosc/raidboot/raidstat.ro
umount -n /dosa
umount -n /dosc
# Stop all the raid arrays (except root)
echo "Stopping raid"
mdstop -a
# See if this is a powerfail situation.
if [ -f /etc/power_is_failing ]; then
echo "Turning off UPS, bye."
/sbin/powerd -q
exit 1
fi
# Now halt or reboot.
echo "$message"
[ ! -f /etc/fastboot ] && echo "On the next boot fsck will be FORCED."
$command -f