From owner-freebsd-scsi Thu Jul 24 02:25:53 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id CAA19293 for freebsd-scsi-outgoing; Thu, 24 Jul 1997 02:25:53 -0700 (PDT) Received: from axe.cablenet.net (axe.cablenet.net [194.154.36.65]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id CAA19287 for ; Thu, 24 Jul 1997 02:25:48 -0700 (PDT) Received: from axe (localhost [127.0.0.1]) by axe.cablenet.net (8.8.6/8.6.9) with SMTP id KAA17342; Thu, 24 Jul 1997 10:22:31 +0100 (BST) Message-ID: <33D71ED7.69D8BD19@cablenet.net> Date: Thu, 24 Jul 1997 10:22:31 +0100 From: Damian Hamill Organization: CableNet Ltd X-Mailer: Mozilla 3.0 (X11; I; SunOS 4.1.4 sun4m) MIME-Version: 1.0 To: Simon Shapiro CC: freebsd-scsi@freebsd.org Subject: Re: New DPT Driver References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-scsi@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Simon Shapiro wrote: > > > Then there is the sticky issue of what stripe size to use. You, in the > * Most news servers use the Unix file system. Right? > * Last I saw, ALL F/S I/O was done in 4Kbytes chunks. > The only way I can see 32MB stripes being even usable, is in setting them > up as CCD stripes of this size. Of course, then you really do all your > I/O in... 4096 bytes. I'm in the process of constructing some news servers and I intend to use ccd. What figure should I use as the interleave factor. The man page suggests that a high figure such as 65,536 should be used for news servers. The system has 8 ST5120N (2 gig narrow, 4500 RPM) drives, and I'm running the busses in Ultra mode (20 Mbps). regards damian -- * Damian Hamill M.D. damian@cablenet.net * CableNet & The Landscape Channel * http://www.cablenet.net/ http://www.landscapetv.com/