Date: Sat, 24 Aug 1996 22:02:03 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com> To: michaelv@MindBender.serv.net (Michael L. VanLoon) Cc: jgreco@brasil.moneng.mei.com, freebsd-isp@freebsd.org, mvanloon@microsoft.com Subject: Re: Anyone using ccd (FreeBSD disk striper) for news Message-ID: <199608250502.WAA17595@GndRsh.aac.dev.com> In-Reply-To: <199608241935.MAA05511@MindBender.serv.net> from "Michael L. VanLoon" at "Aug 24, 96 12:35:46 pm"
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> > >At $60 a controller I say stuff the machine with controllers and spread > >your disks out over them! (On a PCI system that means 3 SCSI controllers, > [...] > >Your drives then obviously get spread out among the busses. Note: I stripe > >_across_ busses because I intuitively believe that this may give me better > >response. > > Could you give me an example? > > How does this fit your scheme: two AHC2940UW's (I can probably get > these easier than NCR controllers -- cost isn't a significant factor) > with tagged-command-queuing enabled, four drives (2-4GB), two per > controller. If I put a single ccd across all of them, going in the > order 1, 3, 2, 4. Does that sound like a fairly well optimized start? > > Or, maybe even three AHC2940UW's with six drives, 1, 4, 7, 2, 5, 8, 3, > 6, 9, in a single large ccd. Save yourself some slot space and allow for future growth, if your going to go multiple AIC7xxx get AHA3940UW's which are the equivlent of 2 2940UW's on one card. Does anyone out there make a card with multiple NCR 53C8xx chips on it?? -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Reliable computers for FreeBSD
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