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Date:      Thu, 13 Dec 2001 21:46:41 -0800
From:      Robert Clark <res03db2@gte.net>
To:        "Andrew C. Hornback" <achornback@worldnet.att.net>
Cc:        Brett Glass <brett@lariat.org>, hardware@FreeBSD.ORG
Subject:   Re: Where to put the CD on an IDE system?
Message-ID:  <20011213214641.A60944@darkstar.gte.net>
In-Reply-To: <009301c1843b$16f9efa0$6600000a@ach.domain>; from achornback@worldnet.att.net on Thu, Dec 13, 2001 at 08:03:06PM -0500
References:  <200112120307.UAA07750@lariat.org> <009301c1843b$16f9efa0$6600000a@ach.domain>

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I seem to remember that switching from one IDE channel to the
other, on some IDE controllers at least, can take enough time
to cause a performance hit. But its a pretty vague memory.

[RC]


On Thu, Dec 13, 2001 at 08:03:06PM -0500, Andrew C. Hornback wrote:
> > -----Original Message-----
> > From: owner-freebsd-hardware@FreeBSD.ORG
> > [mailto:owner-freebsd-hardware@FreeBSD.ORG]On Behalf Of Brett Glass
> > Sent: Tuesday, December 11, 2001 10:07 PM
> > To: hardware@freebsd.org
> > Subject: Where to put the CD on an IDE system?
> >
> > Yes, I know the purists in the UNIX world favor SCSI -- and I do, too --
> > but I'm configuring a system that has IDE/ATAPI and need to figure
> > out how best to distribute three devices among two IDE interfaces.
> >
> > The machine will be a Web proxy. It'll have a system hard drive
> > (containing the OS and swap) and then a second very large one
> > to hold the cache. There's also a CD-ROM.
> >
> > Which devices should go on which interface for the best
> > performance, and why?
> 
> 	Put the CD-Rom on a chain by itself, and put the two hard drives on a
> single chain.
> 
> 	Why?  This generally keeps the I/O stream from slowing down any time that
> the CD-Rom drive is polled.  If the CD-Rom is only going to be used for
> installing the OS, why not remove it entirely before putting the system into
> production?  That way, you can put each drive on it's own controller, which
> would maximize your throughput even further.
> 
> --- Andy
> 
> 
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