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On 11/13/2014 10:05 PM, Patrick Gautschi wrote:

quoted

That means something else is waking up those disks. To verify 
this use something like:

FS are not mounted and arrays stopped. There is nothing that wakes
them up. If a switch them off manually with hdparm -Y they stay
off.

Are you running udisks?  If so then that is the culprit.  It polls the
drive's SMART stats every 10 minutes unless the drive is already
asleep, so if the timeout is >= 10 minutes ( which it seems WD drives
refuse to go any lower anyhow ), then the drive will never go to
standby.  I posted some patches to fix this a while back on the
devkit-devel mailing list but I think the udisks maintainer has still
not gotten around to applying them.


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