From owner-freebsd-hardware Wed Jan 12 10:52: 8 2000 Delivered-To: freebsd-hardware@freebsd.org Received: from mail.rz.fh-wilhelmshaven.de (mail.rz.fh-wilhelmshaven.de [139.13.25.134]) by hub.freebsd.org (Postfix) with ESMTP id 575EB1556E for ; Wed, 12 Jan 2000 10:51:02 -0800 (PST) (envelope-from ohoyer@fbwi.fh-wilhelmshaven.de) Received: from fettesau.stuwo.fh-wilhelmshaven.de (stuwopc5.stuwo.fh-wilhelmshaven.de [139.13.209.5]) by mail.rz.fh-wilhelmshaven.de (8.9.3/8.9.3) with SMTP id TAA20984; Wed, 12 Jan 2000 19:50:31 +0100 (MET) Message-Id: <4.1.20000112194049.009b7ba0@mail.rz.fh-wilhelmshaven.de> X-Sender: ohoyer@mail.rz.fh-wilhelmshaven.de X-Mailer: QUALCOMM Windows Eudora Pro Version 4.1 Date: Wed, 12 Jan 2000 19:48:41 +0100 To: Gustavo V G C Rios From: Olaf Hoyer Subject: Re: hardware Cc: freebsd-hardware@FreeBSD.ORG In-Reply-To: <387CC44B.E56EA655@ddsecurity.com.br> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org "Adaptec 274X/284X/2920C/294x/2950/3940/3950 (Narrow/Wide/Twin) series >EISA/VLB/PCI SCSI controllers." Hi! Well, this does mean controllers based around the AIC 78xx chipsets up to AIC 788x, which means they are all single-ended SCSI. U2W is differential SCSI and begins with the AIC 789x chips. > >But in /sys/i386/conf/LINT, i got no reference showing me that my system >support 3950U2W. >The only reference line, points me: > ># The `ahc' device provides support for the Adaptec 29/3940(U)(W) ># and motherboard based AIC7870/AIC7880 adapters. see above... -- snipped some stuff --- >If adaptec 3950U2W is not supported by FreeBSD 3.4Stable, i am >considering using 2940U2W. >I would like to hear from you, what options on hard disk i have (Ones >that delivers 80MB/s) and how success you have gotten using them. No actual HDD thats available does 80 MB/sec. the fastest ones (like the Barracuda series or Atlas or DRVS) do about 20 MB/sec under best circumstances, regarding the mechanical parts of them. electronic transfer (drive chache on electronic to PCI/main memory) of course is much faster. The only drives that could be able to delever that as a single drive are the solid state HDDs, mainly consisting of RAM chips... This money nowadays is mostly better spent in better mainboard with larger amount of RAM. The 80 MB/sec make sense regarding a RAID config or simply some (3-4) drives being used at the same time, like in a file server without RAID, or in a workstation which does some multimedia stuff, because the drives share the total bandwidth of the controller. Regards Olaf Hoyer -------- Olaf Hoyer www.nightfire.de mailto:Olaf.Hoyer@nightfire.de FreeBSD- The power to serve ICQ:22838075 Liebe und Hass sind nicht blind, aber geblendet vom Feuer, dass sie selber mit sich tragen. (Nietzsche) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message