Tejun Heo wrote:
This really isn't a regression. It's been always like that with libata.
libata doesn't make devices go into standby mode and shutdown(8) does
it for libata. The problem here is that libata does issue
SYNCHRONIZE_CACHE on shutdown. So, the sequence of event is...
1. shutdown(8) issues SYNCHRONIZE_CACHE followed by STANDBY_NOW
This part is presumably distribution dependent. I have never seen Fedora
or CentOS shut down drives on power down from the shutdown script/utility..
2. kernel shutdown starts
3. libata shutdown issues SYNCHRONIZE_CACHE
4. power goes off
Some drives seem to spin up at step #3 even when its cache is clean and
power goes off right after the disk finishes the command. So, it's
really bad when it happens - spin down, spin up followed by immediate
power off.
--
Robert Hancock Saskatoon, SK, Canada
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