Yep, I did this with wdidle.exe on a USB with a copy of freedos. Then, wdtler.exe apparently enabled TLER functionality. My Greens were as new as 2010, out of 8 I had since 2009, four died after being my main file storage for basically a decade, two holdovers are currently recording 6 cameras on Blue Iris 24/7 because I set it up as a backup to milestone and the milestone VM took a shit during an upgrade. Seeking with them is crap though, I'm replacing them with 4TB HGST 7200 SAS drives any day now (or replacing the whole thing with milestone again). Never heard anything about them changing rpm dynamically AFAICR.Unless there's stuff out there that I've never heard of, I don't think you can set or change RPM on a mechanical drive. Even Western Digital admitted after the fact that Green drives were fixed RPM.
Most of the "savings" was from agressive headparking and the like, which in the early models would wear them out in a matter of months. During the period when Green and Red were mostly the same mechanically, those tools were great to set the Greens to mirror Red behavior and no wear out too fast. WD put a stop to that though in later models.
Yeah, I didn't think they were persistent as I've seen people discussing startup scripts, chalk it up to wishful thinking. I was hoping you'd surprise meJust checking, but you're aware that IPMITOOL settings aren't persistent? (or at least they never were for me!) You either need to run the command(s) after boot each time, or have a script that runs. As noted elsewhere though, the best practice is to set the fan duty cycle at Full/100% in the Sensors menu of the BMC, and use IPMI tool to adjust from there. This means that your boots will always be at full speed till the scipt runs (or you hand jam the command).
I actually unplugged a power supply the other day while the machine was running and found out the alarm goes off if the PSU is unplugged, but not if the PSU is removed from the machine. That seemed kind of self-defeating, hopefully if a PSU is actually non-operational the alarm will still go off to alert me of the problem.My 920SQs are the quietest server power supplies I've ever heard (not that I'm an expert). That said, there's other, non SQ supplies that are darn quiet, while others are super loud. If you're curious just how loud your PSU fans are, you can always unplug the other fans (MOMENTARIALLY!), so that only the PSU fan is running under power, and boot the system to a prompt. It won't all fry in a minute, and a minute is often all it takes for you to say "OK, that's not just grating on my ears, its really grating!".
I have 500w PSUs in my 836, presumably because I did a power consumption analysis and found the system probably never goes over 275w, so anything over 550w is dropping in efficiency exponentially (the most efficient pairing is a PSU that is 2x what you need for the system).
This makes pairing SM PSUs kind of hard for home users because their offerings are all so damn beefy, but barely anyone even knows about the efficiency curve so I guess the perception that "bigger is better" is a good marketing excuse to entice people out of more money.
I also have some 720w PSUs that were in my 825, and I swapped them out. They sound like garbage, just like you said - grating. The 500w ones are fine though, I'll find out the model # and edit later, don't want to bounce around on my phone and find all I've written has been lost.
Unraid is neat for lots of reasons and seems to bring a lot of functionality to people who are less technically inclined. I see their folks struggling with vfio every now and then when I'm looking up kernel flags. Not meant to be a dig, those are complicated things to be doing with an os targeted at the more general market, it's neat that it's possible for them, as well (but they do struggle).
I was able to spin down disks intermittently using camcontrol in freebsd back when I used it with a passthrough lsi 2008, I found it to be negligibly useful and never re-enabled it when I migrated to OmniOS (ages ago), but I might do it again. Def not a bad idea for my dedicated backup system. Video recording, not so much. It's all about the application/use case, amirite?
Just upgraded laterally to the new Truenas Scale and haven't even looked under the hood yet. Went from FreeBSD 13 to Debian and operates just the same, was completely transparent from a user interface perspective. Super impressed! Want to see what this whole "scale out v. scale up" storage thing is about first-hand. I have a feeling I'm going to like it, though.