Power down harddisc / which process till uses folder?

[Freestila]

Hello together, i have a small problem.

I have one Pool of "standard" harddiscs, that i use as the NAS part, and one SSD for Home automation etc.
In the beginning i choose the harddsic pool as storaeg for jails, but changed it later to the ssd.

I wanted to power down the harddrives when there is no usage, and i set the HDD standby to 60 minutes.

However, from the sound it seems the harddrives do not power down.
I noticed, that there is a directory iocage on the mount, and if i try to delet it with "rm -r", it says "Device busy". So i think that maybe some process is stil using that directory, and therefore the hdd pool is not powered down.

How can i check which process / service uses this directory? The config in the jails view points to the SSD pool.

Thanks in advance :)

 

[Chris Moore]

However, from the sound it seems the harddrives do not power down.

Hardware details are needed. Please review this guide:

https://www.ixsystems.com/community/threads/forum-guidelines.45124

 

[HoneyBadger]

If your system dataset is on the pool, it won't spin down. There's also reports that any kind of share access, even to a separate pool, will spin the drives back up. If you have two separate protocols (eg: SMB on HDD, NFS on SSD) then you can avoid this, but if you have SMB shares on both, accessing the SSD shares may still spin up the HDDs.

https://www.ixsystems.com/community/threads/how-to-let-drives-spin-down.26314/

 

[Chris Moore]

In addition to what @HoneyBadger said, there is some evidence that drives connected by way of a SAS controller will not spin-down at all.

I reiterate, we need hardware details.

 

[Freestila]

Ok, sry :)
So the server is a N54L Microserver. 3x2TB HDD as pool 1, shared with SMB. Pool 2 is one SSD, no share but a vm with Openhab2.
As far as i know, the N54L has one SAS Controller.
Boot is an USB stick on USB Port. Base Hardware of N54l is here, hope this helps.
No additional network cards or so.