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 > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hardware" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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