From owner-freebsd-questions Sun Mar 5 18:58: 6 2000 Delivered-To: freebsd-questions@freebsd.org Received: from mta1.snfc21.pbi.net (mta1.snfc21.pbi.net [206.13.28.122]) by hub.freebsd.org (Postfix) with ESMTP id 4699C37B841 for ; Sun, 5 Mar 2000 18:58:03 -0800 (PST) (envelope-from rpseguin@yahoo.com) Received: from yahoo.com ([209.233.25.191]) by mta1.snfc21.pbi.net (Sun Internet Mail Server sims.3.5.1999.09.16.21.57.p8) with ESMTP id <0FQZ00ITOC3HJA@mta1.snfc21.pbi.net> for freebsd-questions@FreeBSD.ORG; Sun, 5 Mar 2000 18:54:53 -0800 (PST) Date: Mon, 06 Mar 2000 02:52:36 +0000 From: Ralph Seguin Subject: CCD striped disks are no faster than conventional To: freebsd-questions@FreeBSD.ORG Message-id: <38C31D74.4BB1D272@yahoo.com> MIME-version: 1.0 X-Mailer: Mozilla 4.7 [en] (X11; U; Linux 2.2.13 i686) Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit X-Accept-Language: en Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Hi. Any idea on why my striped ccd partition is no faster than any other paritition? I would expect to see much faster reads and writes. I've tried a variety of interleaves between 16 and 512 and the speed is more or less constant. I have two IDE drives, each on a different IDE channel. Kernel is configured ok, I've already built the filesystem and everything. Setup: FreeBSD 3.3-RELEASE Pentium III 500, 256M RAM, 13GB + 9GB 13GB disk: nutmeg# disklabel -r /dev/wd0 # /dev/wd0: type: ESDI disk: wd0s1 label: flags: bytes/sector: 512 sectors/track: 63 tracks/cylinder: 255 sectors/cylinder: 16065 cylinders: 1662 sectors/unit: 26712000 rpm: 3600 interleave: 1 trackskew: 0 cylinderskew: 0 headswitch: 0 # milliseconds track-to-track seek: 0 # milliseconds drivedata: 0 8 partitions: # size offset fstype [fsize bsize bps/cpg] a: 81920 0 4.2BSD 1024 8192 16 # (Cyl. 0 - 5*) b: 1058592 81920 swap # (Cyl. 5*- 70*) c: 26712000 0 unused 0 0 # (Cyl. 0 - 1662*) e: 614400 1140512 4.2BSD 1024 8192 16 # (Cyl. 70*- 109*) f: 5210368 1754912 4.2BSD 1024 8192 16 # (Cyl. 109*- 433*) g: 19746720 6965280 4.2BSD 1024 8192 16 # (Cyl. 433*- 1662*) nutmeg# disklabel -r /dev/wd2 # /dev/wd2: type: ESDI disk: wd1s1 label: flags: bytes/sector: 512 sectors/track: 63 tracks/cylinder: 255 sectors/cylinder: 16065 cylinders: 1229 sectors/unit: 19746720 rpm: 3600 interleave: 1 trackskew: 0 cylinderskew: 0 headswitch: 0 # milliseconds track-to-track seek: 0 # milliseconds drivedata: 0 8 partitions: # size offset fstype [fsize bsize bps/cpg] c: 19746720 0 unused 0 0 # (Cyl. 0 - 1229*) e: 19746720 0 4.2BSD 1024 8192 16 # (Cyl. 0 - 1229*) nutmeg# cat /etc/ccd.conf ccd0 64 none /dev/wd0s1g /dev/wd1s1e Thanks. -Ralph To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message