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#!/bin/sh
[ -x /sbin/hdparm ] || exit $NA
# Default values on AC
DRIVE_SPINDOWN_VALUE_AC="${DRIVE_SPINDOWN_VALUE_AC:-0}"
DRIVE_WRITE_CACHE_AC="${DRIVE_WRITE_CACHE_AC:-1}"
DRIVE_POWER_MGMT_AC="${DRIVE_POWER_MGMT_AC:-254}"
DRIVE_ACOUSTIC_MGMT_AC="${DRIVE_ACOUSTIC_MGMT_AC:-0}"
# Default values on battery
DRIVE_SPINDOWN_VALUE_BAT="${DRIVE_SPINDOWN_VALUE_BAT:-6}"
DRIVE_WRITE_CACHE_BAT="${DRIVE_WRITE_CACHE_BAT:-0}"
DRIVE_POWER_MGMT_BAT="${DRIVE_POWER_MGMT_BAT:-1}"
DRIVE_ACOUSTIC_MGMT_BAT="${DRIVE_ACOUSTIC_MGMT_BAT:-254}"
# Default devices to operate on
DRIVE_LIST="/dev/[hs]d[a-z]"
help() {
cat <<EOF
Hard drive Parameters we support tweaking:
Drive spindown:
DRIVE_SPINDOWN_VALUE_AC = time until a drive will spin down on AC
Defaults to 0, which disables drive spindown.
DRIVE_SPINDOWN_VALUE_BAT = time until a drive will spin down on battery
Defaults to 6, which will spin the drive down after 30 seconds of inactivity.
See the -S option on the hdparm manpage.
Drive write caching:
DRIVE_WRITE_CACHE_AC = 0 disables write cache, 1 enables it.
Defaults to 1
DRIVE_WRITE_CACHE_BAT = 0 disables write cache, 1 enables it.
Defaults to 0
See the -W option on the hdparm man page.
Drive power management:
DRIVE_POWER_MGMT_AC = Drive Advanced Power Management value on AC
Defaults to 254 for max performance.
DRIVE_POWER_MGMT_BAT = Drive Advanced Power Management value on battery
Defaults to 1 for max power savings.
See the -B option on the hdparm man page
Drive acoustic management:
DRIVE_ACOUSTIC_MGMT_AC = Drive Acoustic Management value on AC
Defaults to 254 for max head speed.
DRIVE_ACOUSTIC_MGMT_BAT = Drive Acoustic Management value on battery
Defaults to 128 for max quietness.
See the -M option on the hdparm man page.
Drives to manage:
DRIVE_LIST = the list of hard drives to manage.
Defaults to "/dev/[hs]d[a-z]", which will manage up to the first 25 drives.
EOF
}
harddrive_ac () {
for dev in $DRIVE_LIST; do
# disable write caching, do not spin down the drive, disable APM
# and acoustic management, and sync everything to drive.
hdparm -W $DRIVE_WRITE_CACHE_AC \
-S $DRIVE_SPINDOWN_VALUE_AC \
-B $DRIVE_POWER_MGMT_AC \
-M $DRIVE_ACOUSTIC_MGMT_AC $dev
done
}
harddrive_battery() {
for dev in $DRIVE_LIST; do
# disable write caching, enable acoustic management
hdparm -W $DRIVE_WRITE_CACHE_BAT \
-S $DRIVE_SPINDOWN_VALUE_BAT \
-B $DRIVE_POWER_MGMT_BAT \
-M $DRIVE_ACOUSTIC_MGMT_BAT -F $dev
done
}
case $1 in
true) harddrive_battery ;;
false) harddrive_ac ;;
help) help;;
*) exit $NA ;;
esac
exit 0
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