Date: Wed, 12 Jun 1996 12:43:52 -0400 (EDT) From: Sam Brown <root@ns2.clever.net> To: "Jacob M. Parnas" <jparnas@jparnas.cybercom.net> Cc: Bob Loftus <bobster@primenet.com>, "Aaron D. Gifford" <agifford@infowest.com>, freebsd-questions@freebsd.org, bsdi-users@BSDI.COM Subject: Re: Adaptec2940UW vs. BusLogicBT-958 (opinions?) Message-ID: <Pine.BSI.3.93.960612124109.2246A-100000@ns2.clever.net> In-Reply-To: <199606121235.IAA12473@jparnas.cybercom.net>
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I've yet to quite understand why with all the problems induced with one large scsi-bus You would want wide/fast. Consider: The NCR PCI SCSI (ncr53C810) costs $45/qty 1, this is not a symbios clone, but a real ncr chip. We usually start with two , one per spindle, and the io transfers are multiplexed more than the ability of the same two drives on one card. Most noticable during fscheck's during boot. Also a scsi-bus hang, if one ever occurs, doesn't kill the primary drive either. I can't imagine why one would go out of the way to spend a ton of more money on a non-raid controller running wide/ultra. When you still have the weak link of the single controller card and single scsi-cable to impede your reliability. On Wed, 12 Jun 1996, Jacob M. Parnas wrote: > > In message <Pine.BSD.3.91.960611162414.19152A-100000@usr06.primenet.com>you write: > >I believe that Paul Vixie has expounded quite masterfully on this topic > >in the past, check the bsdi-users archive @ nexial.nl as I recall it > >doesn't really matter, and you can't possibly keep the scsi bus busy > >enough to warrant it. "Wide SCSI is just for those suffering from > >spec-envy." "Wide SCSI has lovely marketing, I guess. Everybody wants it, > >nobody needs it." -- Paul Vixie > >Have fun... > > Would you please elaborate a bit on the logic? I don't see why with up to > 15 devices, you couldn't fill up 40MB/sec for a fast/wide/ultra SCSI III bus? > Especially with some raids counting as one large SCSI device? > > Trying to understand, Jacob >
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