Date: Fri, 07 Nov 1997 12:11:45 +1030 From: Mike Smith <mike@smith.net.au> To: Bob Willcox <bob@luke.pmr.com> Cc: Mike Smith <mike@smith.net.au>, Christopher Masto <chris@netmonger.net>, freebsd-chat@FreeBSD.ORG Subject: Re: hardware Message-ID: <199711070141.MAA00357@word.smith.net.au> In-Reply-To: Your message of "Thu, 06 Nov 1997 12:50:06 MDT." <19971106125006.20805@pmr.com>
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> 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? > > 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. mikehome | help
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