reidjr at lineone
Dec 30, 2012, 6:04 AM
Post #9 of 10
On 30/12/12 11:11, Jelte Veldstra wrote:
Re: Optimal disk configuration for MythTV?
[In reply to]
>> Cool detailing, thank you. Great food for thought. May I ask which version
>> are you running of myth now? Is this power consumption calculated or
>> measured, if measured by what means?
> An Intel system with a Sandy Bridge or Ivy Bridge CPU and a H61/67/77
> Q61/67/77 would draw about 20W idle without harddisks, OS on an SSD
> and a Pico PSU or any other efficient PSU. With some tweaking you may
> even get a little close to 17W. When adding harddisks a rule of thumb
> would be that green 3.5" drives draw 4-6W idle and "normal" 3.5"
> drives 8-9W idle. Laptop drives are interesting for low power builds
> as well and may take little more than half of the 3.5" drives. These
> numbers are based on personal experience where I measured consumption
> using a wattmeter (Voltcraft Energy Logger 4000) and experience shared
> in fora on this topic.
> So getting a system that stays well under the 100W mark is very
> feasible. Under 50W should be relatively easy as well as long as you
> limit the number of harddrives. The version of MythTV should be
> irrelevant when it comes to power consumption. For Intel based builds
> http://lesswatts.org is an interesting site offering power saving
> tips. AMD based builds can be very efficient as well, so it is
> definately not a must to go for Intel if you want something power
> efficient, but in fora there is less information on AMD builds
> compared to Intel.
> mythtv-users mailing list
> mythtv-users [at] mythtv
Got to agree with this.
I've been running mythtv for 10 years or so, and have been through
countless sets of Hardware. I've jumped back and forward trying power
hungry old hardware with screaming fans, to newer hardware that went to
sleep overnight to NAS based backends. NAS/ARM based stuff is just too
slow, and always requires lots of fiddling to get to work. The mini ATom
based boards are more mainstream, but are slow and always seem to use
more power than you expect.
I've pretty much settled now on running low end Intel systems, always on
and doing as much as possible on the one box. So I have an "always on"
desktop machine, home server and mythbackend in one box.
So you burn power all the time, but it is mainstream, cheap and if you
work out how many times you turn on the PC to check email etc, you are
not wasting that much.
OS (Ubuntu 12.04 LTS) mysql etc are all running on a 64G SSD, so no
spin-up when not recording/playing back. This makes a real difference
to speed, particularly database access, power
I have 2x 1.5 TB samsung green drives, 1 WDx2 TB, 1 Seagate x 2TB, all
for storage. I have an external 3TB WD drive as backup (rsnapshot) which
I mount and dismount by cron to make sure it stays asleep. I do let my
storage drives spindown when not used.
CPU is a e530 Dual core sandybridge on an h61 motherboard. I have 1 USB
DVB-T, and a dual DVB-S2 cards as tuners.
Most of the time the system idles at about 60Watts at the wall, ( using
a killawatt/Maplin power meter) and when needed there is enough grunt to
do other stuff (trans-coding compiling etc). With a modern processor,
you can even underclock to save power.
Having "tried it all" I found you can spend serious money to try to
bring down the power to a minimum, but the base power usage of the
tuners and HDs is what will drive it all back up from that theoretical
minimum. So my recommendation is use modern cheap bottom of the range
components.The power at idle is a bit more than the absolute minimum you
can get away with. ( my revo frontend is about 20Watts, the setup with a
full size sandybridge processor is about 35-40 Watts for the equivalent
base components ) Even in the UK thats still only another £20 of
electricity a year always on.
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