Date: Wed, 19 Jun 2013 11:34:39 -0500 From: "Matthew D. Fuller" <fullermd@over-yonder.net> To: Jeremy Chadwick <jdc@koitsu.org> Cc: freebsd-stable@freebsd.org, Adam Strohl <adams-freebsd@ateamsystems.com> Subject: Re: shutdown -r / shutdown -h / reboot all hang and don't cleanly dismount Message-ID: <20130619163439.GH1940@over-yonder.net> In-Reply-To: <20130619161634.GA73965@icarus.home.lan> References: <51C1979D.3010305@ateamsystems.com> <20130619122143.GA70813@icarus.home.lan> <51C1A9BF.8030304@ateamsystems.com> <20130619133538.GA71689@icarus.home.lan> <51C1BCF6.8090606@ateamsystems.com> <20130619150414.GA72566@icarus.home.lan> <20130619155346.GG1940@over-yonder.net> <20130619161634.GA73965@icarus.home.lan>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, Jun 19, 2013 at 09:16:35AM -0700 I heard the voice of Jeremy Chadwick, and lo! it spake thus: > > The above CDB + subcommand disables APM entirely. There is a lot > more to APM than just parking heads (and in all honesty, APM should > have nothing to do with parking heads). Disabling APM can actually > have drastic effects on drive temperature (meaning there are certain > chip and/or motor operations that said feature controls *in > addition* to head parking), and other firmware-level features that > aren't documented. True enough, in concept. With all the drives sitting behind ventilation perfectly capable of dealing with 15kRPM drives, I don't worry about what that might do to the 7200's though... > Furthermore, that CDB does not work for all drives. There are > Seagate drives -- I know because I bought some and returned them > when the APM trick did not work -- that lack the LCC-disable tie-in > to APM. The drive either rejected the CDB (ATA status code error > returned), while others accepted it but nothing in 0xec (IDENTIFY) > reported as got changed. Well, I haven't seen it with these. Several of ada0: <ST1000DM003-9YN162 CC4D> ATA-8 SATA 3.x device and some systems with CC4C too. > I will have -- and eat -- their souls. The problem with that is that the undigestible bits of "soul" just get passed right back into the ecosystem, and in a more concentrated form. Some might suggest that's already happened, and is got us here in the first place 8-} -- Matthew Fuller (MF4839) | fullermd@over-yonder.net Systems/Network Administrator | http://www.over-yonder.net/~fullermd/ On the Internet, nobody can hear you scream.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20130619163439.GH1940>