Running Windows Server 2012 R2 as a Hyper-V host.
I want hard drives to spin down after they have been idle for some time. (None of these hard drives are used by any Hyper-V VMs)
The applicable setting in Windows power settings is set to spin down disks after 20 minutes idle, but it does not appear that they ever spin down.
How can I make it so that HDDs will spin down after being idle for some time?
The drives are standard desktop-level drives which do support power management. The controller is a Dell Perc H200 in IT mode - I am unable to find any information on whether this supports power management but my understanding is that in IT mode it should not matter. I have found some information to suggest that Windows disables this functionality when Hyper-V is installed?
Using smartctl to set the drives to "standby" reports that it works, and subsequent queries using smartctl report that the drives are in standby mode. Whether they have actually spun down or not I can't tell? However it appears the drives never go into this mode on their own.