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#!/bin/bash
#
# Copyright (C) 2012 Canonical
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
get_load_cycle()
{
smartctl -A /dev/sda | grep Load_Cycle_Count | awk '{print $10}'
}
get_time_secs()
{
date "+%s"
}
if [ $EUID -ne 0 ]; then
echo "Need to run as root e.g. use sudo"
exit 1
fi
hdparm -B 127 /dev/sda
TEST_FILE=test
MAX_TIMEOUT=60
MAX_ITERATIONS=10
dirty_disk()
{
rm -f ${TEST_FILE}
touch ${TEST_FILE}
truncate -s 4K ${TEST_FILE}
}
drop_caches()
{
sync
(echo 1 | sudo tee /proc/sys/vm/drop_caches) > /dev/null
(echo 2 | sudo tee /proc/sys/vm/drop_caches) > /dev/null
(echo 3 | sudo tee /proc/sys/vm/drop_caches) > /dev/null
}
find_load_cycle_threshold()
{
lc1=0
lc2=0
count=0
TIMEOUT=1
echo Attempting to find Spin Down timeout for this HDD
while [ $lc1 -eq $lc2 -a $TIMEOUT -lt $MAX_TIMEOUT ]
do
lc1=$(get_load_cycle)
count=$((count + 1))
dirty_disk
drop_caches
sleep $TIMEOUT
lc2=$(get_load_cycle)
n=$((lc2 - lc1))
echo Checking with timeout: $TIMEOUT seconds, Load Cycles: $n
if [ $TIMEOUT -lt 15 ]; then
TIMEOUT=$((TIMEOUT + 1))
else
TIMEOUT=$((TIMEOUT + $TIMEOUT/5))
fi
done
}
exercise_load_cycle()
{
echo "Attempting to exercise load cycle on HDD"
i=0
t1=$(get_time_secs)
n1=$(get_load_cycle)
# bump timeout by 1 second just to make sure
# we can always catch the load cycle window
TIMEOUT=$((TIMEOUT + 1))
while [ $i -lt $MAX_ITERATIONS ]
do
i=$((i + 1))
echo "Load Cycle $i of $MAX_ITERATIONS"
dirty_disk
drop_caches
sleep $TIMEOUT
done
i=0
t2=$(get_time_secs)
n2=$(get_load_cycle)
t=$((t2 - t1))
n=$((n2 - n1))
echo "Managed to force $n Load Cycles in $t seconds."
life=$((1000000 * $t / $n))
days=$((life / (3600 * 24)))
echo "At this rate, the HDD will fail after $days days."
}
find_load_cycle_threshold
if [ $TIMEOUT -lt $MAX_TIMEOUT ]; then
echo "HDD seems to be spinning down aggressively."
exercise_load_cycle
exit 1
else
echo "Gave up looking for Load Cycle timeout threshold, HDD looks sane."
exit 0
fi
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