Date: Tue, 03 Oct 1995 10:47:37 -0700 From: "Justin T. Gibbs" <gibbs@freefall.FreeBSD.org> To: Terry Lambert <terry@lambert.org> Cc: gibbs@freefall.FreeBSD.org (Justin T. Gibbs), rsnow@txdirect.net, nc@ai.net, questions@freebsd.org Subject: Re: RAID solutions for FreeBSD Message-ID: <199510031747.KAA09309@aslan.cdrom.com> In-Reply-To: Your message of "Tue, 03 Oct 1995 10:41:11 PDT." <199510031741.KAA01408@phaeton.artisoft.com>
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>> >I *know* that 1-3 can be done without sequencer level coding. I suspect >> >that 4-5 can be too, albiet at a *very* high cost in processing time. > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >> >Check out the ZEBRA FS papers (RAID II). >> >> I read it last year. It would be a total waste to do the parity > ^^^^^^ >> calculations on the host processor when the card will do this for > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >> you (assuming I can get docs). > >I know, I know -- it's just that the idea of a software-only soloution >is very attractive. Putting the calculations in the sequencer code >may be more efficient, but it's wholly unportable. Well, this is a different issue. I thought we were talking about supporting vendor RAID solutions. >Well, unless we write a high level sequencer language and "compile" it >to NCR + Adaptec, etc. I don't know how similar the sequencer instruction >set is; probably not very. Not even close. > Terry Lambert > terry@lambert.org -- Justin T. Gibbs =========================================== Software Developer - Walnut Creek CDROM FreeBSD: Turning PCs into workstations ===========================================
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