I have the same effect with my backup disc on my server since my last
reboot. It's with 2.6.26-2-amd64 kernel of current debian sid. The
Hitachi SATA disc in question is connected as a single device unit via
3ware 9650SE-4LPML.

My scripts always worked properly (using sdparm -C stop) but now when I
issue the SCSI STOP command, I see the drive status on my SATA backplane
going on error for approx. 1 sec. After that I hear the drive spinning
up again (which was just about to *start* its spindown, so it resarts
while approx. still 85% spinning speed).

The curious thing ist that reverting to my previous kernel (scripts
worked with, I log the drive status using "smartctl --nocheck standby")
did not help either. So I'm stuck. Neither sdparm nor smartctl packages
were updated even since the kernel version before the now old one. Using
scsi-spin or sg_start doesn't help either.

-- 
hard disk will not spin down with kernel 2.6.29-11
https://bugs.launchpad.net/bugs/359513
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