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From: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Mon, 17 Mar 2008 10:33:24 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Cc: 
Subject: cvs commit: src/sys/sys ata.h src/sbin/atacontrol atacontrol.8
 atacontrol.c src/sys/dev/ata ata-all.c ata-all.h ata-disk.c
 ata-disk.h
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phk         2008-03-17 10:33:23 UTC

  FreeBSD src repository

  Modified files:
    sys/sys              ata.h 
    sbin/atacontrol      atacontrol.8 atacontrol.c 
    sys/dev/ata          ata-all.c ata-all.h ata-disk.c ata-disk.h 
  Log:
  Add a "spindown" facility to ata-disks:  If no requests have been received
  for a configurable number of seconds, spin the disk down.  Spin it back
  up on the next request.
  
  Notice that the timeout is only armed by a request, so to spin down a
  disk you may have to do:
  
          atacontrol spindown ad10 5
          dd if=/dev/ad10 of=/dev/null count=1
  
  To disable spindown, set timeout to zero:
  
          atacontrol spindown ad10 0
  
  In order to debug any trouble caused, this code is somewhat noisy on the
  console.
  
  Enabling spindown on a disk containing / or /var/log/messages is not
  going to do anything sensible.
  
  Spinning a disk up and down all the time will wear it out, use sensibly.
  
  Approved by:    sos
  
  Revision  Changes    Path
  1.30      +8 -0      src/sbin/atacontrol/atacontrol.8
  1.47      +27 -0     src/sbin/atacontrol/atacontrol.c
  1.281     +6 -0      src/sys/dev/ata/ata-all.c
  1.128     +3 -0      src/sys/dev/ata/ata-all.h
  1.207     +49 -1     src/sys/dev/ata/ata-disk.c
  1.53      +1 -1      src/sys/dev/ata/ata-disk.h
  1.39      +3 -0      src/sys/sys/ata.h