From owner-freebsd-hackers Fri Oct 29 21:14:49 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from midten.fast.no (midten.fast.no [195.139.251.11]) by hub.freebsd.org (Postfix) with ESMTP id 14D5E14C8C for ; Fri, 29 Oct 1999 21:14:44 -0700 (PDT) (envelope-from tegge@fast.no) Received: from fast.no (IDENT:tegge@midten.fast.no [195.139.251.11]) by midten.fast.no (8.9.3/8.9.3) with ESMTP id GAA22428; Sat, 30 Oct 1999 06:14:32 +0200 (CEST) Message-Id: <199910300414.GAA22428@midten.fast.no> To: wes@softweyr.com Cc: sjr@home.net, freebsd-hackers@FreeBSD.ORG Subject: Re: CCD questions From: Tor.Egge@fast.no In-Reply-To: Your message of "Fri, 29 Oct 1999 12:05:30 -0600" References: <3819E1EA.83DD04B7@softweyr.com> X-Mailer: Mew version 1.70 on Emacs 19.34.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Date: Sat, 30 Oct 1999 06:14:32 +0200 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > Because Vinum is being maintained, and because Vinum will allow you to > stripe your disks instead of simple concatenate them, which will probably > result in better I/O rates. Some simple measurements shows ccd to be slightly faster when striping 11 disks, then running 130 threads reading 1MB blocks from random sector-aligned positions in a 10 GB file. with Vinum: 70 MB/s (2 of the 11 subdisks shown in iostat output) tty da5 da6 cpu tin tout KB/t tps MB/s KB/t tps MB/s us ni sy in id 0 94 171.82 36 5.96 174.53 38 6.48 0 0 16 3 80 0 35 173.90 36 6.13 174.79 36 6.10 0 0 9 3 88 1 47 175.33 35 6.01 173.96 38 6.44 0 0 9 3 88 1 378 175.69 38 6.53 170.85 38 6.28 0 0 9 3 88 1 37 176.47 37 6.42 173.21 35 5.87 0 0 9 3 88 0 36 176.05 39 6.72 172.27 35 5.87 0 0 9 3 87 0 36 168.95 40 6.60 172.89 36 6.14 0 0 9 4 87 0 36 169.44 39 6.42 171.73 38 6.30 0 0 8 4 88 0 36 172.64 37 6.24 174.79 38 6.44 0 0 9 3 88 With ccd: 80 MB/s tty ccd1 cpu tin tout KB/t tps MB/s us ni sy in id 0 39 204.46 408 81.56 0 0 5 1 94 0 39 205.28 413 82.75 0 0 5 1 94 0 39 204.91 438 87.72 0 0 7 1 92 0 39 204.96 429 85.96 0 0 6 1 93 0 39 205.13 439 87.85 0 0 6 1 93 0 39 204.80 448 89.61 0 0 5 1 94 0 39 204.77 428 85.66 0 0 5 1 94 0 39 204.66 440 87.95 0 0 6 1 93 0 39 205.58 421 84.61 0 0 5 1 94 ccd is also capable of striping disks with different sizes. - Tor Egge To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message