Date: Sat, 13 Sep 2003 02:20:35 -0700 From: Darren Pilgrim <dmp@bitfreak.org> To: John-Mark Gurney <gurney_j@efn.org> Cc: freebsd-current <freebsd-current@freebsd.org> Subject: Re: How do put an ATA disk into sleep/standby mode? Message-ID: <20030913022035.261bfb15.dmp@bitfreak.org> In-Reply-To: <20030913081616.GV39788@funkthat.com> References: <20030911175541.2da727af.dmp@bitfreak.org> <20030913081616.GV39788@funkthat.com>
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On 2003.09.13 01:16:16 -0700, John-Mark Gurney <gurney_j@efn.org> wrote: > Darren Pilgrim wrote this message on Thu, Sep 11, 2003 at 17:55 -0700: > > In my workstation, running 5.1-R, I have two disks, one containing > > FreeBSD, the other Windows. Since the Windows disk isn't used at > > all when in FreeBSD, I would like to put it into standby or sleep > > mode(whichever is necessary) to make it spin down, reducing heat and > > noise production--both of which have become a real problem. > > > > This is at least technically possible, since spinning down a disk is > > part of the APM sleep mode. The capabilities list atacontrol > > reports for the disk in question shows power management and advanced > > power management as being supported, and I've gotten Windows to spin > > down this disk. I haven't had any luck figuring out how to do this > > in FreeBSD, though. > > > > So how do I accomplish this? > > Well, in -current, sos has commited a frame work that will let a > userland utility to send arbitrary commands to the disks, and so > this will be possible from a utility. I may just wait for 5.2 to work on this, then. > I wanted this feature too, and I happen to be browsing around the ata > spec and noticed that you can include a spin down time as part of the > disk idle command.. The disk idle command appears to be quite > harmless as it just asks the drive to go to idle (if it was doing a > read ahead or something else). So, I have this patch. I originally > did this against 4.2-R I believe, but I think I have updated it to a > more recent version.. (the revisions it's against are in the patch).. > > hope this helps you. It does, in that it confirms that it's at least possible to spin down disks without suspending the entire machine. What I was thinking of, though, was a program or extension to atacontrol that would send the standby or sleep signal and detach the device to avoid having an unresponsive device entry.
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