Date: Fri, 26 Mar 2010 14:38:04 -0400 From: "Aravind K. Mikkilineni" <amikkili@ecn.purdue.edu> To: freebsd-hardware@freebsd.org Subject: Re: intellipark leads to high load cycle count Message-ID: <201003261438.04897.amikkili@ecn.purdue.edu>
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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 use these drives in a home file server, though, so I/O to/from the drives is either non-existant most of the time (heads stay parked) or there is continuous I/O (rdiff backups, etc.; heads stay unparked). -akm
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