How to know what app is preventing HDDs to idle

[gustavo1spbr]

I have my Synology configured to idle the HDDs after x minutes of innactivity, but this never happens. Anytime I check they are spinning, and they get reasonably warm, which is a loss of lifespan and electricity, plus unnecessary noise.

So my question is whether there is a way to verify what app / process is preventing the HDDs to idle. Thanks a lot!

 

[sfx2000]

Anytime I check they are spinning, and they get reasonably warm, which is a loss of lifespan and electricity,

They should spin down - however if you have shares mounted on clients, they may be keeping files open or other activity...

Keeping the drives spinning uses very little power, and is actually better for lifespan of the drives - most failures occur at spin up from dead idle.