@truefriend-cz
You cut off part of the output, the part that states the hard drive make/model and is important to me, I do not need the serial number.
If that is the problem you are reporting then I would agree that it is a problem. I was thinking you wanted the drives to sleep for long periods of time. You need to ensure that the drives are setup as follows: HDD Standby: ALWAYS ON, Advanced Power Management: DISABLED, Acoustic Level: DISABLED, S.M.A.R.T.: ENABLED/TRUE and this should eliminate the drives from sleeping, UNLESS the drive is a laptop type drive where it will put itself to sleep constantly. I have my test NAS setup with old laptop hard drives. They work for testing but they park after a few seconds on non-use. It makes some of my testing slow but they do what I need and they were scrap parts. And you can play with these settings but look at the SMART report ID's 192 and 193 to see if the heads are unloading still.
As for your drives, the data provided indicated that your drives were powered off 272 times and that the heads remain loaded the entire time the power was applied. This means that the drives did not spin down nor unload the heads, both of which are desirable aspects for a frequently used NAS.
These appear to be new drives so I must ask, did you perform any burn-in testing on them? If not, I'd recommend you do this to weed out any surface damage and give you some peace of mind. If you do not, that is fine, it is just a recommendation.
A concern... You have had your hard drives running for basically 30 days power-on time and have cycled power to them 272 times. I have had my four hard drives for 3.5 years and power cycled them half of what you have done. That is a lot. These values could be the same because the drive electronics mirrors the head load/unload cycles in which case sleeping the drive (motor spins down not power turned off), or you really have cycled power that many times. A little investigation on the make/model of the drive would result in knowing if the two values mirror each other at all times.
If I knew the inner working of the TrueNAS application then I'd offer some advice. In the old days we would have the source code, modify it, and compile it. Anything good that came out of it would likely be incorporated into the FreeNAS. I have not done that in a great many years.
Good luck, hope you find the solution you are looking for.