Hi there.
I recently purchased a WD Blue Mobile (WD10JPVX-22JC3T0) 1TB HDD for usage with my BananaPi (via SATA).
The BananaPi runs the operating system OpenMediaVault (Debian based Linux). The integration of the HDD was no problem and it works very well.
But there’s one problem I encountered:
After the last access it takes 3-10 seconds until the heads move to park position and the disk spins down - regardless of the Spindown Time I set up for the disk.
As the disk is accessed several times within an hour this heavily increases the Load_Cycle_Count and the Start/Stop_Count for this drive.
To get a reasonable compromise between power consumption and hardware stress I wanted to have a Spindown Time around 10 - 30 minutes so I tried setting the values for Advanced Power Management (APM), Automatic Acoustic Management (AAM) and Spindown Time via OpenMediaVault - without any success so far.
My actual observings for different settings are like this:
-
Every APM value >= 128 seems to keep the disk spinned up all the time (regardless of the Spindown Time value).
-
Every APM value <= 127 makes the disk spin down 3-10 seconds after the head reached parking position and completely ignores the Spindown Time value.
-
Setting APM to 255 (“Disabled” for HDDs with Notebook Bug) seems to dramatically heat up the disk and also makes more noise but doesn’t spin down, also.
Issuing a
hdparm -S 120 /dev/sda
command results in hdparm reporting back:
/dev/sda:
setting standby to 120 (10 minutes)
But again the disk spins down 3-10 seconds after the head reaches parking position and completely ignores the standby time.
If anyone could explain to me why this happens and how I am able to get the drive set up the way I wanted it to be I’d be very thankful.
Best regards.
