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Date: Thu, 18 Apr 2002 14:22:20 -0700
From: Mike Fedyk <mfedyk@matchmail.com>
To: Helge Hafting <helgehaf@aitel.hist.no>
Cc: linux-kernel@vger.kernel.org
Subject: Re: IDE/raid performance
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On Thu, Apr 18, 2002 at 09:41:20AM +0200, Helge Hafting wrote:
> Mike Fedyk wrote:
> 
> > I'd imagine that IDE would need some protocol spec changes before this could
> > be supported (at least a "spin the drive up" message...).
> > 
> Exists already.  You may use hdparm to tell IDE drives
> to spin up and down or even set a timeout.  This is
> mostly for power-saving or no-noise setups.
>

Oh yes, I know about that, but didn't remember it when I posted.

> So they could indeed add a jumper to IDE drives to let them
> power up in the spun-down state.  But that's not what
> the vast majority of one-disk users want.
> 

This is the specific thing I was talking about.  Even if the drive can power
down with a command, it doesn't wait for a command to perform the spinup
when power is applied, and that's what's missing.

It seems like there is already protocol support in IDE, so the drive just
needs a way to be configured...  Maybe some drives will allow software
config of this when they implement it?

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