Date: Wed, 16 Aug 2000 00:09:40 -0700 From: Peter Wemm <peter@netplex.com.au> To: David Scheidt <dscheidt@enteract.com> Cc: Terry Lambert <tlambert@primenet.com>, fran@reyes.somos.net, "Nicole Harrington." <nicole@unixgirl.com>, "(Mike Tancsa)" <mike@sentex.net>, "chat@FreeBSD.ORG" <chat@FreeBSD.ORG> Subject: Re: 3ware IDE Raid. SCSI killer? Message-ID: <200008160709.AAA18408@netplex.com.au> In-Reply-To: <Pine.NEB.3.96.1000815175620.90457C-100000@shell-1.enteract.com>
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David Scheidt wrote: > (cc's snipped.) > On Tue, 15 Aug 2000, Terry Lambert wrote: > > :> On Sat, 12 Aug 2000 00:09:34 +0000 (GMT), Terry Lambert wrote: > :> >...as a backhand reference to the fact that IDE dtill does not > :> >support concurrent outstanding I/O via tagged command queueing. > :> > :> I could be wrong, but I though I read some reference to tagged > :> queing on the 3ware site. > : > :The standard supports it. No one implements it in any drives. > : > > I've been led to believe this is because if they did, the disks would cost > almost as much as SCSI disks. The only thing IDE has going for it is that > it's cheap. No, it is only a software change. It costs no difference at all to manufacture and ship an IDE disk with tagged queueing implemented. All it needs is a once-off investment in programmer time for an almost trivial task compared to the other stuff that the firmware has to do. Cheers, -Peter -- Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au "All of this is for nothing if we don't go to the stars" - JMS/B5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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