My initial objective was to get below 15 watts idle power on a NAS with 3x4TB in Raid5.
After upgrading to Kralizec today (re-install on Debian 7.5.0) and using the lastest Kernel backport 3.14 with a few power tweaks (powertop), I can confirm that my OMV bild is running at equal power consumption compared with my ARM based NAS but providing a much higher transfer and system performance. Transfer SMB performance is maxing out GiB Network >100MByte/sec.
Power figures are measured at the AC side 230V /w KD 302 and confirmed with Energy Check 3000
40 watts - 2 parallel SMB large file copies to/from OMV NAS maxing out GiB speed
33 watts - 1 SMB large file copy to/from OMV NAS
28 watts - incremental file access/backup
21 watts - OMV idle / 3x4TB disks spinning
12 watts - OMV idle/ 3x4TB disks spun down
The build is based on the Intel DH87RL, i3-4130T (non-T was not avail at purchase order), mSATA PCIe 30GB Kingston, 3x 4TB WD RED, Enermax ETL300AWT Triathlor 80 Plus, 1x4GB DDR3-1600. Heads free operation: no Monitor, Keyboard or Mouse!
Disks are filled up 80%. In the future I might add up to two more 4TB disks if needed.
Latest BIOS update and using recommended settings for FANs gave another watt reduction.
http://www.heise.de/ct/projekt…s-und-Server-1375124.html
For those interested in the Debian 7.5.0 Haswell power tweaks (still experimental), which I added in
/etc/rc.local - these setting provide all "good" result from powertop
#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
# SATA Link Power Management
for i in /sys/class/scsi_host/host*/link_power_management_policy;
do echo min_power > $i;
done
# Runtime PM for PCI Device
for i in /sys/bus/pci/devices/????:??:??.?/power/control;
do echo auto > $i;
done
# Reduce disk activity by waiting up to 10 minutes before doing writes
echo 90 > /proc/sys/vm/dirty_ratio
echo 1 > /proc/sys/vm/dirty_background_ratio
echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
# Set sound card power savings
echo 1 > /sys/module/snd_hda_intel/parameters/power_save
#disable NMI
echo 0 > /proc/sys/kernel/nmi_watchdog
#disable wol
ethtool -s eth0 wol d
exit 0
#-------------------------- end of rc.local -------------------------
Alles anzeigen
AND to use highest possible savings with the built-in HD graphics (enable deepest rc6)
/etc/modprobe.d/i915.conf
Furthermore I am re-thinking to use autoshutdown, which is working quite well. Assuming max 12h savings time the resulting energy cost saving is calculated to be around 15.- EUR per year, which I probably will take leveraging the effect of comfort having the NAS accessible all time and almost immediately. The WD RE´s are spinning up quite fast. And I am considering to split the boot disk into 2 partitions making one avail. for some services that do not need to have the monster drives spun up.
This is the status as per today and without more time for detailed research.
Pls. let me know your suggestions and if we can go much lower and how