From owner-freebsd-isp Sat Aug 24 23:54:45 1996 Return-Path: owner-isp Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id XAA14629 for isp-outgoing; Sat, 24 Aug 1996 23:54:45 -0700 (PDT) Received: from lassie.eunet.fi (lassie.eunet.fi [192.26.119.7]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id XAA14624 for ; Sat, 24 Aug 1996 23:54:43 -0700 (PDT) Received: from key.hole.fi by lassie.eunet.fi with SMTP id AA03248 (5.67a/IDA-1.5 for ); Sun, 25 Aug 1996 09:54:39 +0300 Received: (from count@localhost) by key.hole.fi (8.7.5/8.6.12) id JAA01591; Sun, 25 Aug 1996 09:54:39 +0300 (EET DST) From: "Bror 'Count' Heinola" Message-Id: <199608250654.JAA01591@key.hole.fi> Subject: Re: Anyone using ccd (FreeBSD disk striper) for news In-Reply-To: <199608241935.MAA05511@MindBender.serv.net> from "Michael L. VanLoon" at "Aug 24, 96 12:35:46 pm" To: michaelv@MindBender.serv.net (Michael L. VanLoon) Date: Sun, 25 Aug 1996 09:54:38 +0300 (EET DST) Cc: freebsd-isp@freebsd.org X-Mailer: ELM [version 2.4ME+ PL25 (25)] Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-isp@freebsd.org X-Loop: FreeBSD.org Precedence: bulk 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.