switchnoflushd

linux 系统控制硬盘旋转和停止的程序（spin down/up）

#!/bin/sh -e
#
# $Id: switchNoflushd,v 1.1 2002/04/20 15:34:37 nold Exp $
#
# Wrapper script to switch noflushd timeouts and log the result.
#
# Contributed by Thomas Link <[e-mail]>

getNext () {
	echo $1 | sed -e "s/\\([0-9]\\+\\).*/\\1/"
}

NOFLUSHD_DIR=/var/lib/noflushd

kill -s SIGHUP `cat /var/run/noflushd.pid`

DEFAULT_TIMEOUT=`cat ${NOFLUSHD_DIR}/timeout`
STATE=`cat ${NOFLUSHD_DIR}/state`
if [ -e ${NOFLUSHD_DIR}/history ]; then
	HIST=`cat ${NOFLUSHD_DIR}/history`
fi

REST=`echo ${DEFAULT_TIMEOUT} | sed -e "s/^\\(${HIST},\\|.*\\)\\(.*\\)/\\2/"`
NEW=`getNext ${REST}`
if [ -z "${NEW}" ]; then
	NEW=`getNext ${DEFAULT_TIMEOUT}`
	echo ${NEW} > ${NOFLUSHD_DIR}/history
else
	echo ${HIST},${NEW} > ${NOFLUSHD_DIR}/history
fi
echo ${NEW} > ${NOFLUSHD_DIR}/state

logger -t noflushd set timeout to ${NEW}