From: Tejun Heo <tj@kernel.org>
To: Bruce Allen <ballen@gravity.phys.uwm.edu>
Cc: Alexander Clausen <alex@gc-web.de>, linux-ide@vger.kernel.org
Subject: Re: Frequent head unloading
Date: Sun, 23 Nov 2008 12:16:22 +0900 [thread overview]
Message-ID: <4928CB06.7090708@kernel.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0811211309400.12550@gc.phys.uwm.edu>
Bruce Allen wrote:
> Yes, this is hard to do in a general way. The problem is that you have
> to correctly find the head load/unload counts in the SMART data. This
> is not specified by any standard. It might be there, it might not be.
> I don't see a general solution to this.
Well, till now, all the identifiers I've seen are pretty limited, I'm
fairly sure we can easily come up with a pattern which will cover most
devices currently on market. The more difficult problem seems to be
what action to take to me since there's no single APM value we can use
and changing APM setting seems to have quite adverse effect on some
drives. Maybe the best thing we can do is to periodically issue
commands to keep the drive busy (at least for a while).
Thanks.
--
tejun
prev parent reply other threads:[~2008-11-23 3:16 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-16 14:07 Frequent head unloading Alexander Clausen
2008-11-17 3:46 ` Tejun Heo
2008-11-17 5:01 ` Alexander Clausen
2008-11-17 5:16 ` Tejun Heo
2008-11-17 10:10 ` Alexander Clausen
2008-11-21 8:04 ` Tejun Heo
2008-11-21 12:08 ` Alexander Clausen
2008-11-21 15:25 ` Tejun Heo
2008-11-21 19:11 ` Bruce Allen
2008-11-23 3:16 ` Tejun Heo [this message]
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