Date: Sun, 11 Sep 2016 12:02:07 -0500 From: "Matthew D. Fuller" <fullermd@over-yonder.net> To: Allan Jude <allanjude@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Laptop disk spindown Message-ID: <20160911170207.GG79735@over-yonder.net> In-Reply-To: <384fd7ca-b779-3e66-eaa9-c2c27dca4dc0@freebsd.org> References: <50125b8f-f24d-6b78-f474-7e97017302e3@m5p.com> <384fd7ca-b779-3e66-eaa9-c2c27dca4dc0@freebsd.org>
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On Sun, Sep 11, 2016 at 12:55:27PM -0400 I heard the voice of Allan Jude, and lo! it spake thus: > On 2016-09-11 12:50, George Mitchell wrote: > > Smartctl reports that my laptop disk has started and stopped > > 101,798 times in 2,027 hours of operation, or roughly once a > > minute. I imagine that saves wear and tear on the disk, Actually, it dramatically _increases_ the wear and tear on the disk... > This is controlled by the drive firmware, not the OS, however, you > can often use camcontrol(8) to adjust it. > > I don't have the exact command handy, sorry. In /etc/rc.local on a system whose drives I once had to do this on, I've got: # Shut off APM on the drives to stop the load cycle count from blowing # up. # x-ref: http://forums.freebsd.org/showthread.php?t=9885 #for i in 0 2; do #. /sbin/camcontrol cmd ada${i} -a "EF 85 00 00 00 00 00 00 00 00 00 00" #done (now, this is not a laptop, so "shut off APM" was a totally reasonable hammer to swing here; whether there's something more nuanced that would be preferable in the laptop case, I don't know) -- Matthew Fuller (MF4839) | fullermd@over-yonder.net Systems/Network Administrator | http://www.over-yonder.net/~fullermd/ On the Internet, nobody can hear you scream.
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