Date: Mon, 06 Mar 2000 02:52:36 +0000 From: Ralph Seguin <rpseguin@yahoo.com> To: freebsd-questions@FreeBSD.ORG Subject: CCD striped disks are no faster than conventional Message-ID: <38C31D74.4BB1D272@yahoo.com>
next in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?38C31D74.4BB1D272>