Date: Thu, 6 Nov 1997 20:36:38 -0600 From: Bob Willcox <bob@pmr.com> To: Mike Smith <mike@smith.net.au> Cc: Christopher Masto <chris@netmonger.net>, freebsd-chat@FreeBSD.ORG Subject: Re: hardware Message-ID: <19971106203638.26346@pmr.com> In-Reply-To: <199711070141.MAA00357@word.smith.net.au>; from Mike Smith on Fri, Nov 07, 1997 at 12:11:45PM %2B1030 References: <19971106125006.20805@pmr.com> <199711070141.MAA00357@word.smith.net.au>
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On Fri, Nov 07, 1997 at 12:11:45PM +1030, Mike Smith wrote: > > On Fri, Nov 07, 1997 at 03:26:37AM +1030, Mike Smith wrote: > > > You don't RC. IDE moved the register set of the WD1003 onto the disk; > > > arguably a Bad Idea but see my response to Joerg for commentary on > > > progress lately. The "smarts" in an IDE and SCSI disk are prettymuch > > > comparable. > > > > However, does the current specification/hardware for IDE allow the > > overlapping of commands (seeks on one drive with data xfer on another)? > > Yes. > > > (Not to mention multiple commands pending per drive, i.e., command tag > > queuing.) > > Yes. > > > None of the IDE controllers I have used do (admittedly, I > > haven't bothered with IDE in years). > > And from this vantage point you seek to criticise? No, not a criticism. Simply asking a question and qualifying my perspective. > > > > People making impassioned arguments based on their experience "years > > > ago" are strongly urged to reevaluate this technology at their leisure. > > > No promises are made as to absolute results, merely that consideration > > > for these disks should *not* be summarily dismissed as is the vogue. > > > > See my comment above. Till IDE supports overlapped operations to > > multiple devices on the same controller, it will lose in MY environment! > > ... so I suggest that you start agitating for software support for more > advanced IDE disk features. Mr John Hood (cgull@smoke.marlboro.vt.us > IIRC) is our current high-end IDE god. Perhaps throwing the odd > encouragement and (equipment) donation his way might see you able to > save some serious money in the longer term. This begs the question...does the currently available crop of IDE hardware support these more advanced features? If not, what can software do to overcome that? I would have thought very little. BTW, though I know little about IDE, I am quite familiar with SCSI and have written a few SCSI device drivers over the years. -- Bob Willcox Deliberation, n.: The act of examining one's bread bob@luke.pmr.com to determine which side it is buttered on. Austin, TX -- Ambrose Bierce, "The Devil's Dictionary"
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