From owner-freebsd-questions@FreeBSD.ORG Tue Mar 9 12:36:15 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 03E8916A4CF for ; Tue, 9 Mar 2004 12:36:15 -0800 (PST) Received: from watcher.puryear-it.com (unknown [69.2.39.107]) by mx1.FreeBSD.org (Postfix) with ESMTP id C6CF143D2D for ; Tue, 9 Mar 2004 12:36:14 -0800 (PST) (envelope-from dap99@i-55.com) Received: from localhost (unknown [127.0.0.1]) by watcher.puryear-it.com (Postfix) with ESMTP id 1838534D35 for ; Tue, 9 Mar 2004 14:29:00 -0600 (CST) Received: from watcher.puryear-it.com ([127.0.0.1]) by localhost (watcher.puryear-it.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 38229-03 for ; Tue, 9 Mar 2004 14:28:59 -0600 (CST) Received: from yourqqh4336axf (localhost [127.0.0.1]) by watcher.puryear-it.com (Postfix) with SMTP id E6B7E34D1E for ; Tue, 9 Mar 2004 14:28:58 -0600 (CST) Message-ID: <002b01c40615$f7d41dd0$6401a8c0@yourqqh4336axf> From: "adp" To: Date: Tue, 9 Mar 2004 14:32:04 -0600 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2727.1300 X-Virus-Scanned: by amavisd-new Subject: iostat and watching disk performance for Promise RAID.. X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 Mar 2004 20:36:15 -0000 My disk device is /dev/ar0: # mount /dev/ar0s1a on / (ufs, local) /dev/ar0s1h on /home (ufs, local, soft-updates) /dev/ar0s1e on /tmp (ufs, local, soft-updates) ... Yet iostat shows /dev/adX: n# iostat 5 tty ad0 ad4 ad6 cpu tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id 0 3 0.00 0 0.00 0.00 0 0.00 0.00 0 0.00 2 2 26 1 69 0 448 0.00 0 0.00 15.43 24 0.37 14.80 26 0.37 4 0 9 4 84 0 541 0.00 0 0.00 6.67 1 0.00 6.00 3 0.02 12 0 16 6 66 0 730 0.00 0 0.00 4.84 6 0.03 5.67 9 0.05 4 0 12 8 77 0 483 0.00 0 0.00 2.00 0 0.00 2.00 0 0.00 9 0 10 5 76 ... Is iostat simply breaking out my RAID-1 (/dev/ar0) into its two component drives? If I had three drives composing /dev/ar0 would I then see ad0, ad4, adX? /dev/ad6 here is just a drive we use for short-term backups, and is not RAID. I just want to confirm. Thanks!