Date: Sun, 25 Aug 1996 09:54:38 +0300 (EET DST) From: "Bror 'Count' Heinola" <count@key.hole.fi> To: michaelv@MindBender.serv.net (Michael L. VanLoon) Cc: freebsd-isp@freebsd.org Subject: Re: Anyone using ccd (FreeBSD disk striper) for news Message-ID: <199608250654.JAA01591@key.hole.fi> In-Reply-To: <199608241935.MAA05511@MindBender.serv.net> from "Michael L. VanLoon" at "Aug 24, 96 12:35:46 pm"
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Michael L. VanLoon taisi sanoa: > > 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? Why wouldn't you use a AHC 3940? That card has two SCSI buses so you wouldn't run out of PCI slots so fast. At work I built a P166 machine with 3940 and four 2G HP disks spread over the two buses. Raw speed from a single disk is around 5MB/sec, ccd (with stripe size 32 - I didn't experiment with different sizes) gives 11MB/sec write and 13MB/sec read. And those drives are 'only' 5400 rpm and narrow. My setup is also 1-3-2-4. -- Bror 'Count' Heinola % count@key.hole.fi % http://pobox.com/~count/ Pengerkatu 13b A5 % IRC: Count NIC: BH271 % FI-00530 HELSINKI % Work: bror@sms.fi % Roads? Where we're going, Cell: +358-40-5533-554 % Santa Monica Software % we don't need roads.
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