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[IFT 201]Computer and Network Systems: Organization and AdministrationLab 8: Monitoring I/O Performance on Linux –5pts*10 = 50 ptsIntroductionTheiostatcommand is used to monitor the load on server input/output (I/O)devices by observing the time the devices are active compared to the averagetransfer rate of the device.iostatgenerates several report lines that can be usedto monitor and subsequently change the system configuration to better balancethe I/O workload between physical disk devices.DescriptionIn this lab, we’ll use theiostatutility to monitor I/O on Linux.iostatis part of thesysstatutilities which is maintained by Sebastien Godard.sysstatis open source software written in C, and is available under the GNUGeneral Public License, version 2.You can download the latest version here:http://sebastien.godard.pagesperso-orange.fr/download.htmlWe’ll use the ASU Unix box for this lab.To log into the system, you’ll need a terminal emulator, such as PuTTY.After installing and launching PuTTY, connect to the ASU Linux machine usingthe credentials below:Hostname:general.asu.eduUser name: YOUR ASURITE usernamePassword: YOUR ASURITE passwordOn Mac, you don’t need PuTTY. Simply bring up theTerminaland type:ssh general.asu.eduORssh@<YOUR USERNAME> general.asu.eduTheiostatutility is already installed on the ASU General system. We’ll just use it.By defaultiostatproduces two reports; theCPU Utilization reportand theDeviceUtilization report.The default invocation shows the statistics since system start up, then exits.-bash-3.2$ iostatLinux 2.6.18-416.el5xen (general1)11/14/2016avg-cpu:%user%nice %system%iowait%steal%idle3.800.000.250.060.0195.88Device:tpsBlk_read/sBlk_wrtn/sBlk_readBlk_wrtnxvda9.503.15171.972581377140838290xvda10.000.040.00306981186xvda29.503.11171.962550479140837104xvdb1.080.5515.1044923512362776xvdb11.080.5515.1044903512362776dm-023.583.66187.062996194153199880Page 1

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• 1493098234-IFT201 lab8.doc