From owner-freebsd-hardware Fri Apr 24 13:05:51 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id NAA16381 for freebsd-hardware-outgoing; Fri, 24 Apr 1998 13:05:51 -0700 (PDT) (envelope-from owner-freebsd-hardware@FreeBSD.ORG) Received: from dingo.cdrom.com (dingo.cdrom.com [204.216.28.145]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id NAA16351; Fri, 24 Apr 1998 13:05:41 -0700 (PDT) (envelope-from mike@dingo.cdrom.com) Received: from dingo.cdrom.com (localhost [127.0.0.1]) by dingo.cdrom.com (8.8.8/8.8.5) with ESMTP id NAA01282; Fri, 24 Apr 1998 13:02:29 -0700 (PDT) Message-Id: <199804242002.NAA01282@dingo.cdrom.com> X-Mailer: exmh version 2.0zeta 7/24/97 To: dwilde1@ibm.net cc: freebsd-advocacy@FreeBSD.ORG, freebsd-hardware@FreeBSD.ORG Subject: Re: *** Real Action Item: SPECweb In-reply-to: Your message of "Fri, 24 Apr 1998 11:57:51 PDT." <3540E0AF.C3B5C576@ibm.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Fri, 24 Apr 1998 13:02:29 -0700 From: Mike Smith Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > Tom wrote: > > > Better off using the hardware RAID0 in a DPT PM334UW. It also has 64MB > > of write-back cache so, it can re-order i/o to be more efficient. > > > > Also, using only tiny bit of each hard drive improves drive level > > caching. Most drives have only a 1MB cache. > > I have a friend at Winchester Systems who's trying to sell me a SCSI-3 > RAID box, and I think they'd be willing to let us borrow one for a test > in return for favorable mention http://www.winsys.com. He says they work > with fast differential 2944's as host cards. Is the DPT faster with the > direct bus connection? No SCSI at all? It sounds like there's some requirement to use disks; if throughput is an issue then the DPT is probably the way to go. > Does anybody have experience with these new Compact PCI chassis that > have 8 PCI slots? An obvious bottleneck for anything we can do is going > to be the chassis limitation on most of 4 PCI. These are generally 4 slots and a bridge with 4 more behind. Depending on the configuration and the hardware in question, more slots is not necessarily better. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message