Date: Tue, 26 Jan 2010 21:19:46 -0700 (MST) From: Warren Block <wblock@wonkity.com> To: Alexander Best <alexbestms@wwu.de> Cc: freebsd-hackers@freebsd.org Subject: Re: Spin down HDD after disk sync or before power off Message-ID: <alpine.BSF.2.00.1001262116490.32131@wonkity.com> In-Reply-To: <permail-20100126191723f7e55a9d00001a52-a_best01@message-id.uni-muenster.de> References: <permail-20100126191723f7e55a9d00001a52-a_best01@message-id.uni-muenster.de>
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On Tue, 26 Jan 2010, Alexander Best wrote: > because of kern/140752 i looked through a discussion back in 2009 > (http://lists.freebsd.org/pipermail/freebsd-hackers/2009-March/027879.html) > concerning freebsd's hdd spin down procedure. right now ATA_FLUSHCACHE is > being used although the hitachi hdd specs referenced in the pr say that this > will not cause proper load/unload and thus an emergency unload will occur > which reduces the life expectancy of hdds dramatically (20.000 shutdowns vs. > 600.000 shutdowns). unfortunately the discussion back then didn't come up with > any sort of decision/patch. > > attached you'll find a very simple patch which issues ATA_STANDBY_IMMEDIATE > instead of ATA_FLUSHCACHE during hdd spin down. > > could somebody with hdd knowledge comment on this? this matter seems quite > important since there may be a chance that the current spin down mechanism in > freebsd damages hdds! Does the shutdown sound different with that patch? On a couple of different notebooks here, unpatched FreeBSD makes a "GLINK!" sound when the drive parks, much louder than other operating systems on the same notebooks. -Warren Block * Rapid City, South Dakota USA
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