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Most of the power draw is from the hdds. I have the same issue. If you want less power consumption. Invest in SSD or SSD and HDD hybrid where you store quick access files on SSD and rare access on hdd (then you can spin them down with timeout of , let’s say 30-60 min). This should save some energy
If you can figure out how to get a qnap to spin down its disks, please let me know lol. I've been searching for months and haven't found a reliable solution. I basically only need to access it once a day at MOST, so having the disks spinning away for like 99% of their life sucking down power is something I'd like to avoid. The problem seems to be that even with a perfectly clean slate, no services running, the system set up in their own RAID0 SSD pool, the HDD's, even with 0 bytes of data on them, are being pinged for access at least once a minute. I'm assuming it's some log being written to, but it's not anything visible in the file system, and I haven't been able to find any solution online, lots of people seem to have the same issue.
I'm tempted more and more every day to just grab one of those low-power embedded ITX boards and build up a custom rig. Other than the disk spinning constantly, the TS-462 does everything I need perfectly.
if it's for drive health stats, and the device runs linux, hd-idle could help. it only counts actual block device (so, storage) access as activity
edit: https://github.com/adelolmo/hd-idle
They run a custom vendor-locked distro named QTS, so they're not really as easy to modify as a normal system, I don't think you can even install programs like that.
I'll definitely bookmark it though if I ever get around to building my own solution, thanks!