script to check disk access on qnap from: https://forum.qnap.com/viewtopic.php?f=55&t=133516

blkdevMonitor_20151225.sh

#!/bin/sh
#================================================================
# Copyright (C) 2008 QNAP Systems, Inc.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#----------------------------------------------------------------
#
# blkdevMonitor_v2.sh
#
#	Abstract: 
#		A program of testing purpose on monitor block device
#
#	HISTORY:
#		2013/05/15	-	Created	- Kent
# 
#================================================================
/sbin/daemon_mgr klogd.sh stop "/etc/init.d/klogd.sh start"
/usr/bin/killall dd 2>/dev/null 1>/dev/null

MD_DEVIVES="md9 md13 md0 md1 md2"
SD_DEVIVES="sda sdb sdc sdd sde sdf sdg sdh"
Do_Log=0
MAXRUN=100
FORCE_STANDBY=0
BLKDEV_LOG=/root/blkdevMonitor_v2.log

analyse_kmsg()
{
	_klog=/.klog
	/bin/touch $_klog
	_standby=1

	# read /proc/kmsg
	while [ 1 ]; do
		/bin/dd if=/proc/kmsg of=$_klog bs=1 count=10240 2>/dev/null 1>/dev/null
		for i in $MD_DEVIVES; do
			/bin/cat $_klog | /bin/grep $i | /bin/grep "dirtied inode"
			if [ $? = 0 ]; then
				/bin/cat $_klog | /bin/grep $i | /bin/grep "dirtied inode" >> $BLKDEV_LOG
				_standby=0
			fi
			/bin/cat $_klog | /bin/grep $i | /bin/grep "block"
			if [ $? = 0 ]; then
				/bin/cat $_klog | /bin/grep $i | /bin/grep "block" >> $BLKDEV_LOG
				_standby=0
			fi
		done
		for i in $SD_DEVIVES; do
			/bin/cat $_klog | /bin/grep $i | /bin/grep "dirtied inode"
			if [ $? = 0 ]; then
				/bin/cat $_klog | /bin/grep $i | /bin/grep "dirtied inode" >> $BLKDEV_LOG
				_standby=0
			fi
			/bin/cat $_klog | /bin/grep $i | /bin/grep "block"
			if [ $? = 0 ]; then
				/bin/cat $_klog | /bin/grep $i | /bin/grep "block" >> $BLKDEV_LOG
				_standby=0
			fi
		done
		if [ $_standby = 0 ]; then
			return 1
		fi
	done
}

_countdown()
{
	/bin/sync;/bin/sync
	/bin/echo -n "Countdown: "
	cntdown=$1
	while [ ${cntdown} -gt 0 ]; do
		/bin/sleep 1
		/bin/echo -n "${cntdown} "
		cntdown=$[$cntdown-1]
	done
	echo
}

_check_standby()
{
	for i in $SD_DEVIVES; do
		/sbin/hdparm -C /dev/${i} 2>>/dev/null | /bin/grep active
		if [ $? -eq 0 ]; then
			echo /dev/${i}
			echo "Some process was waked up HDD..."
			return 1	# HDD is active
		fi
	done
	return 0
}

/bin/echo "===== Welcome to use blkdevMonitor_v2 on `/bin/date` ====="
case "$1" in
	-h)
	/bin/echo "Usage:"
	/bin/echo "  $0 [N]"
	/bin/echo "  N means that monitor block devices N times and generate N log files.(Default N = 100)"
	exit 0
	;;
esac

/bin/echo "Turn off/on VM block_dump & Clean dmesg"
/bin/echo 0 > /proc/sys/vm/block_dump
/bin/dmesg -c 2>/dev/null 1>/dev/null
/bin/dmesg -c 2>/dev/null 1>/dev/null
/bin/dmesg -c 2>/dev/null 1>/dev/null

_cnt=20
while [ ${_cnt} -gt 0 ]; do
	/bin/sync
	/bin/dmesg -c 2>/dev/null 1>/dev/null
	_cnt=$[$_cnt-1]
done
/bin/echo 1 > /proc/sys/vm/block_dump
/bin/date > /dev/null
_countdown 3
# ignore 10240 bytes
/bin/dd if=/proc/kmsg of=/dev/null bs=1 count=10240 2>/dev/null 1>/dev/null

/bin/echo "Start..."

[ "x$1" != "x" ] && MAXRUN=$1
_cnt=0

# remove log
/bin/rm -f $BLKDEV_LOG

while [ ${_cnt} -lt ${MAXRUN} ]; do
	echo "============= $_cnt/$MAXRUN test, `/bin/date` ==============="
	echo "============= $_cnt/$MAXRUN test, `/bin/date` ===============" >> $BLKDEV_LOG
	if [ $FORCE_STANDBY = 1 ]; then
		_check_standby
		if [ $? != 0 ]; then
			for i in $SD_DEVIVES; do
				# force standby
				/sbin/hdparm -y /dev/${i} 2>/dev/null 1>/dev/null
				if [ $? = 0 ]; then
					echo "Issuing standby command in /dev/${i}"
				else
					echo "/dev/${i} not found"
				fi
			done
		fi
		/bin/sleep 20
	fi
	analyse_kmsg
	_cnt=$[$_cnt+1]
	echo
	echo >> $BLKDEV_LOG
done

/bin/echo "Turn off block_dump"
/bin/echo 0 > /proc/sys/vm/block_dump