From owner-freebsd-scsi@FreeBSD.ORG Tue Jun 27 13:21:00 2006 Return-Path: X-Original-To: freebsd-scsi@freebsd.org Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5CABA16A400 for ; Tue, 27 Jun 2006 13:21:00 +0000 (UTC) (envelope-from jerlique@webscene.com.au) Received: from bang.esc.net.au (mx1.esc.net.au [203.25.185.2]) by mx1.FreeBSD.org (Postfix) with ESMTP id C43CC43D83 for ; Tue, 27 Jun 2006 13:20:47 +0000 (GMT) (envelope-from jerlique@webscene.com.au) Received: from localhost (localhost [127.0.0.1]) by bang.esc.net.au (Postfix) with ESMTP id D2B815A6E80; Tue, 27 Jun 2006 22:50:45 +0930 (CST) Received: from bang.esc.net.au ([127.0.0.1]) by localhost (bang.esc.net.au [127.0.0.1:10024]) (amavisd-new) with ESMTP id 80990-09; Tue, 27 Jun 2006 22:50:42 +0930 (CST) Received: from WKSTN501 (lnk6.adl5.adsl.esc.net.au [210.9.186.6]) by bang.esc.net.au (Postfix) with ESMTP id 640955A6E64; Tue, 27 Jun 2006 22:50:42 +0930 (CST) From: "Jerlique Bahn" To: "'Eric Anderson'" Date: Tue, 27 Jun 2006 22:50:42 +0930 Message-ID: <005901c699ec$7d70bdb0$6400000a@WKSTN501> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 In-Reply-To: <44A12F44.8050703@centtech.com> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 Thread-Index: AcaZ67wroHUVmHS7QsCNzl1F7g7APgAAGzgg X-Virus-Scanned: by amavisd-new Cc: freebsd-scsi@freebsd.org Subject: RE: Viewing SCSI errors.. X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Jun 2006 13:21:00 -0000 > > I've added a tape drive to my server and the drive only seems to work at > > 2MBps. The drive should be doing about 24MBps. The tape is a DELL 110T > LTO2 > > which runs at about 86Gb/hr. > > > > I am trying to diagnose where my problems could lie, and was wondering > how I > > could see if there are any errors in the communication between the tape > and > > the scsi card (320Mbps). I'm quite confident the speed issue is related > to > > the tape drive or the scsi chain. > > > > Your suggestions welcomed. > > > How did you measure the 2MBps number? With iostat, eg # iostat 5 tty amrd0 amrd1 sa0 cpu tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id 0 12 57.81 2 0.13 53.21 6 0.32 31.99 24 0.76 0 0 1 0 99 0 46 8.00 0 0.00 0.00 0 0.00 32.00 88 2.74 0 0 0 0 100 0 16 0.00 0 0.00 16.00 0 0.01 32.00 87 2.73 0 0 1 0 99 0 15 0.00 0 0.00 0.00 0 0.00 32.00 88 2.74 0 0 0 0 100 0 16 0.00 0 0.00 0.00 0 0.00 32.00 88 2.74 0 0 0 0 99 JB