Since you brought it up, curious, how what is the idle power draw for this whole setup? How much is the front-end computer drawing vs the storage?
I'm assuming you are using smart plugs to truly keep things off and not drawing any power when not in use? All those HDs will be drawing power regardless of being in standby or at idle, unless you are physically disconnecting current from wall. That's what I do at night when I shut off my HTPC and NAS.
Also requires much more power to spin up from standby and of course to do the backups. Are these 5400 RPM or 7200 RPM HDs? More power is used even when in standby for higher RPM drives.
Fact remains that fewer HDs with a higher capacity, will consume less power, then more total HDs. That's why I suggested it. That's all. Wanted to clarify that for anyone else reading this in the future since one might think that high-capacity HDs consume a lot more energy than lower capacity, but they really don't if at all.
Sorry for the late reply, it was a busy week-end... I'm hoping to have some good news to report soon regarding WOL implementation in MC, but I can't say much at this point.
I've implemented support for Vera Lights, I'll create a thread for that explaining how to do it, and I'll link to it in this thread when it's done for those who are interested. I can only support turning the lights off when the film starts and dimming the lights when the film stops, but it's better than nothing. Internal support could add dimming the lights on pause for example.
Regarding your point on servers, I'll reply but I think we should moving on because that's mostly off-topic in this thread.
All you say is correct in general, but I don't think you're familiar with how UnRAID is different from a standard RAID NAS, otherwise you would understand why I'm saying that in my case the number and the size of drives doesn't make a significant difference. Sure, having 21 drives instead of 7 has a marginal impact of around 10-15W, but it doesn't matter as much as with a standard RAID NAS.
With a standard RAID NAS, whenever you want to access a single file, ALL the drives have to spin up. So when you play a film, ALL your drives have to be active. In this situation, obviously having fewer larger drives is desirable. I attach a picture showing my UnRAID servers when playing 4K content. B2K is on stanby, and A4K has only one single drive active (blue LED, in the bottom right).
With UnRAID, whenever you want to access a single file, only ONE data drive needs to spin up. If you're writing data, your parity drive(s) will also spin up, but if you're only reading data, for example when playing a film, only ONE drive is active, ALL the other drives, including the parity drives, are in standby. This is why I'm sayin that in my case, as explained earlier, have fewer drives wouldn't make as much of a difference. The single larger data drive would use a bit more power than a smaller drive when active, but of course I would save more power by having fewer drives in standby.
I bought 6TB drives because at the time it was the largest size supported by my RAID NAS (Synology or QNAP). I simply recycled them in my UnRAID servers, because I can't justify buying 8 20TB at $500 to replace 22 6TB (free).
I am replacing my 6TB parity drives with 20TB and will gradually replace the 6TB with 16TB or 20TB drives when my 24-bays are full.
Regarding power when on standby, there is no need to do this with my UnRAI servers. I have designed them with PSUs that use very little to nothing when on standby, so I don't need to switch them off the wall entirely.
My A4K server uses around 12W when on standby, and my B2K (that I rarely use) uses 0W on stanby (no idea how that's possible, as it uses 7W when powered off, but that's what my kill-a-watt says and it's fairly accurate).
My HTPC uses around 125-135W when playing a film. I can live with that, given that it's also my video-processor (and that I use it for gaming and video editing as well). Its PSU only uses 14W on standby, so I don't feel the need to switch it off the wall entirely. I would do so if it was 30W or more.
I sold my Envy Extreme MKII and my JVC NZ8 projector partially to save power and replaced these two with a Samsung S90C that, combined with my JRVR HTPC as a source, only uses a fraction of what these two used with standard sources (mediaplayer, 4K BD player etc).
So HTPC around 130W and one media server at around 75W only when playing media, that's about 200W in total for the media server I use the most frequently (A4K) and the HTPC. Given that I have a few hundred TBs at my fingertips, that's not too bad. I really don't want to add 200W (A4K and B2K server switched on) just so that I can scroll through my library, without even watching content... Makes no sense to me.
Anyway, hopefully, this will be resolved soon with MC, I'll update the thread when/if it is.
I attach the detailed measurements for each server so you can see the details of their power use.