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Date: Wed, 17 Apr 2002 23:47:13 -0700 (PDT)
From: Andre Hedrick <andre@linux-ide.org>
To: Mike Fedyk <mfedyk@matchmail.com>
cc: Kent Borg <kentborg@borg.org>,
        "Jeff V. Merkey" <jmerkey@vger.timpanogas.org>,
        Alan Cox <alan@lxorguk.ukuu.org.uk>, nick@snowman.net,
        Baldur Norddahl <bbn-linux-kernel@clansoft.dk>,
        Mike Dresser <mdresser_l@windsormachine.com>,
        linux-kernel@vger.kernel.org
Subject: Re: IDE/raid performance
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Already there ...

It is called "specific configuration".
I will add support for it in 2.4 soon enough, once I have satatisfied it
functionally works.

Cheers,

Andre Hedrick
LAD Storage Consulting Group

On Wed, 17 Apr 2002, Mike Fedyk wrote:

> On Wed, Apr 17, 2002 at 01:47:16PM -0400, Kent Borg wrote:
> > 
> > On Wed, Apr 17, 2002 at 10:27:22AM -0700, Jeff V. Merkey wrote:
> > > From my analysis with 3Ware at 32 drive configurations, you really
> > > need to power the drives from a separate power supply is you have 
> > > more than 16 devices.  They really suck the power during initial 
> > > spinup.
> > 
> > It seems an obvious help would be to have the option of spinning up
> > the drives one at a time at 2-3 second intervals.  I know a fast drive
> > doesn't get up to speed in 3 seconds, but the nastiest draw is going
> > to be over by then.
> > 
> > A machine with 32 drives is pretty serious stuff and probably isn't
> > booting in a few seconds anyway--another 60-some seconds might be a
> > desirable option.
> > 
> > Does this exist anywhere?  Would it have to be a BIOS feature?
> 
> I doubt it.
> 
> All of the IDE drives I have used spin up when power is applied.  Most of
> the scsi (except for some really old ones) have a jumper that tells the
> drive to wait until it receives a message from the scsi controller to spin up.
> 
> I'd imagine that IDE would need some protocol spec changes before this could
> be supported (at least a "spin the drive up" message...).
> 
> Mike
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