From owner-freebsd-questions Sat Nov 21 17:06:20 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id RAA12276 for freebsd-questions-outgoing; Sat, 21 Nov 1998 17:06:20 -0800 (PST) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from rain.futuresouth.com (rain.futuresouth.com [198.79.79.125]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id RAA12271 for ; Sat, 21 Nov 1998 17:06:17 -0800 (PST) (envelope-from stormy@rain.futuresouth.com) Received: (from stormy@localhost) by rain.futuresouth.com (8.9.1/8.9.1) id TAA00484 for questions@FreeBSD.ORG; Sat, 21 Nov 1998 19:05:59 -0600 (CST) (envelope-from stormy) Message-ID: <19981121190559.D303@futuresouth.com> Date: Sat, 21 Nov 1998 19:05:59 -0600 From: Stormy Henderson To: "original recipient in envelope at chain.freebsd.os.org.za" Subject: Re: How to use ccd Mail-Followup-To: "original recipient in envelope at chain.freebsd.os.org.za" References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93.2i In-Reply-To: ; from Khetan Gajjar on Sun, Nov 22, 1998 at 02:50:33AM +0200 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG A happy camper (Khetan Gajjar, khetan@chain.freebsd.os.org.za) once wrote... > I've got two SCSI drives I'd like to make into one partition, in order > to write CD-ROM 660+ MB images to. The drives are not identical. DMesg > output is listed below. What would the correct interleave number be for > this scenario ? > da0: Fixed Direct Access SCSI2 device > da0: 516MB (1057616 512 byte sectors: 64H 32S/T 516C) > da1: Fixed Direct Access SCSI2 device > da1: 515MB (1056708 512 byte sectors: 64H 32S/T 515C) I'm a newbie, but I just did this two days ago, and it worked for me. The manpage for ccd says, "For large writes, the optimum interleave factor is typically the size of a track, while for large reads, it is about a quarter of a track." Since you won't need as much speed on reads when writing CDS, use a quarter. Both of your drives are 32 sectors per track with 512 byte sectors, so try an interleave of 8. > Would a ccd partition of da0 and da1 combined together be a good > enough "drive" to use when creating and burning CD-ROM images ? > Once created, I presume the command to create these two partitions into > one would be > ccdconfig -cv ccd0 [interleave value] 0 /dev/da0s1e /dev/da1s1e And put it into /etc/ccd.conf, here's mine: ccd0 16 none /dev/da0s2e /dev/da1s2e > Would this then be mounted with mount /dev/ccd0 /mnt ? After you "newfs -b 8192 -i 1024 /dev/rccd0c", then you "mount /dev/ccd0c /mnt". The newfs will give an error message after it is done, just ignore it, it still worked. Be happy... -- http://www.futuresouth.com/~stormy/signature.html To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message