Date: Fri, 26 Mar 2010 20:11:27 +0100 From: Michiel Boland <michiel@boland.org> To: "Aravind K. Mikkilineni" <amikkili@ecn.purdue.edu> Cc: freebsd-hardware@freebsd.org Subject: Re: intellipark leads to high load cycle count Message-ID: <4BAD06DF.8080604@boland.org> In-Reply-To: <201003261438.04897.amikkili@ecn.purdue.edu> References: <201003261438.04897.amikkili@ecn.purdue.edu>
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Aravind K. Mikkilineni wrote: > On Tue, 23 Mar 2010 Michiel Boland <michiel@boland.org> wrote > >> Hi. I have one of those new green WD HDs with Intellipark, that is, they >> like to park their heads every 8 seconds. As a result the load cycle count >> grows at an alarming rate. (If I understand correctly this number should not >> exceed about 300k or so.) >> >> Is there any way to turn off or increase the 8-second timeout? Or do I have >> to bin the disk and use something better? > > I have some older GP drives which do not seem to ever park their heads. The > newer GP drives I have behave as you described. > > I have had success either turning off the head parking or greatly reducing it > by doing 'hdparm -S 0 -B 254 <device>'. Either '-B 254' or -B 255' depending > on the drive. I guess 'hdparm -B' is equivalent to 'ataidle -P'? In this case I'm out of luck: # ataidle -P 254 /dev/ad4 ataidle: the device does not support advanced power management Cheers Michiel
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