this post was submitted on 15 Mar 2024
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39
Optimize power consumption (derpzilla.net)
submitted 7 months ago* (last edited 7 months ago) by Kwa@derpzilla.net to c/selfhosted@lemmy.world
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So I have finally built my NAS. I used an N100 CPU because I saw it has low power consumption.

Right now I have 2 NVMe SSDs and 2 HDDs. I have installed proxmox on the 2 SSDs as RAID1. I have not partitioned the HDDs yet, they are just plugged in and powered on.

Just booting into proxmox, without any VMs or containers running, I am pulling 45W from the wall. This looks super high to me, and I’m afraid that starting to use the HDDs and running some VMs may double this…

I don’t have much references, but I have an Odroid with an external self-powered HDD, it is using 5W. I have a raspberry pi 4 with an external HDD, the raspberry is pulling 3W and the HDD 3W.

With these data, I was thinking I wouldn’t go over 20W. 45W is enormous and not something I can run 24/7, kind of a fail for a NAS…

Have I done something wrong or is it just how much it’s supposed to pull?

Edit: I have come across powertop. Using the auto tune, I was able to drop to 33-35W. I have unplugged the HDDs and dropped to 22W. I guess I cannot go lower, this may be because of the PSU or the 2 NVMe

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[–] poVoq@slrpnk.net 5 points 7 months ago (9 children)

For power consumption, NVMe drives use quite a lot of power, especially PCIe 4.0 ones. About 5W each during use.

3.5" HDD (especially 7200rpm or more) also consume significantly more than 2.5" 5400rpm HDDs that are optimized for low power (the latter use about 1W during use).

SATA SSDs fall somewhere in the middle.

[–] Kwa@derpzilla.net 2 points 7 months ago (2 children)

Thanks. So If I take 5W a disk, I may have 20W just from the disks.

There are still 25W remaining. For a low power CPU that looks like a lot 😕

[–] poVoq@slrpnk.net 3 points 7 months ago

I never really tested it with 3.5" HDDs, but a google search makes it sound like they might be closer to 10W each.

[–] rambos@lemm.ee 1 points 7 months ago

My guess would be 25W from disks, 10W from CPU+RAM+MBO and 10W waste from PSU. Just a guess as I said

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