{"id":2536,"date":"2012-03-27T05:51:00","date_gmt":"2012-03-27T03:51:00","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/using-iozone-for-linux-disk-performance-analysis\/"},"modified":"2012-03-27T05:51:00","modified_gmt":"2012-03-27T03:51:00","slug":"using-iozone-for-linux-disk-performance-analysis","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/using-iozone-for-linux-disk-performance-analysis\/","title":{"rendered":"Using IOzone for Linux disk performance analysis"},"content":{"rendered":"<p>Who never had to measure the disk performances on a system?<\/p>\n<p>Speaking about Linux performance monitoring includes a significant part of disk performances. If you are facing applications or databases running slower than expected or than on other environments, you may take a look on the I\/O performances.<br \/>\nThis posting aims to provide an introduction to a pretty interesting tool: IOzone.<\/p>\n<p>Under Linux environments, there are plenty of tools to perform I\/O tests, stretching from the simplest and most common ones (i.e.: iostat) to more evolved (complicated?) ones. You may already have heard about bonnie++ or Flexible I\/O, which is presented on Yann Neuhaus&#8217; blog (<a href=\"\/flexible-io-simulating-database-like-io-activity-without-an-installed-database\">see here<\/a>). Even Oracle provides its own tool Orion (see <a href=\"\/simulating-and-testing-io-performances-with-orion\">Gregory Steulet&#8217;s blog<\/a>) to evaluate disk performances.<\/p>\n<h3>IOZone overview<\/h3>\n<p>IOzone (<a href=\"http:\/\/www.iozone.org\">www.iozone.org<\/a>) is an open source solution for file system benchmark. It was originally developed by William Norcott and has been enhanced by Don Capps. In 2007, IOzone has been rewarded the Inforworld BOSSIE award (<a href=\"http:\/\/www.infoworld.com\/infoworld-bossie-awards-755\">http:\/\/www.infoworld.com\/infoworld-bossie-awards-755<\/a>) of the best file I\/O tool. IOzone presents the advantage to be available for almost all main platforms such as Linux, AIX, Solaris, BSD, MacOSX, and also Windows through Cygwin.<\/p>\n<p>Basically IOzone runs the following tests on a file, which is then split in smaller slices:<\/p>\n<ul>\n<li>ID 0 : Read \u2013 indicates the performance of reading a file that already exists in the filesystem.<\/li>\n<li>ID 1 : Write \u2013 indicates the performance of writing a new file to the filesystem.<\/li>\n<li>ID 2 : Re-read \u2013 after reading a file, this indicates the performance of reading a file again.<\/li>\n<li>ID 3 : Re-write \u2013 indicates the performance of writing to an existing file.<\/li>\n<li>ID 4 : Random Read \u2013 indicates the performance of reading a file by reading random information from the file &#8211; i. e. this is not a sequential.<\/li>\n<li>ID 5 : Read.<\/li>\n<li>ID 6 : Random Write \u2013 indicates the performance of writing to a file in various random locations. i.e this is not a sequential write.<\/li>\n<li>ID 7 : Backward Read.<\/li>\n<li>ID 8 : Record Re-Write.<\/li>\n<li>ID 9 : Stride Read.<\/li>\n<li>ID 10 : Fread.<\/li>\n<li>ID 11 : Fwrite.<\/li>\n<li>ID 12 : Freread.<\/li>\n<li>ID 13 : Frewrite<\/li>\n<\/ul>\n<p>The complete description of each test can be found in the IOzone documentation. Note that in case of databases benchmarking the tests, 0 to 6 are particularly interesting.<\/p>\n<h3>IOzone Installation<\/h3>\n<p>IOzone can be installed as follows:<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">[root@vmoratest1 tmp]# wget http:\/\/www.iozone.org\/src\/current\/iozone-3-398.i386.rpm\n--2012-03-15 10:15:42-- \u00a0http:\/\/www.iozone.org\/src\/current\/iozone-3-398.i386.rpmResolving www.iozone.org... 208.45.140.198Connecting to www.iozone.org|208.45.140.198|:80... connected.HTTP request sent, awaiting response... 200 OKLength: 755116 (737K) [application\/x-rpm]Saving to: `iozone-3-398.i386.rpm'\n100%[==================================================================&gt;] 755,116 \u00a0 \u00a0 \u00a0278K\/s \u00a0 in 2.7s \u00a0 \u00a0\n2012-03-15 10:15:45 (278 KB\/s) - `iozone-3-398.i386.rpm' saved [755116\/755116]\n\n[root@vmoratest1 tmp]# ls io*iozone-3-398.i386.rpm\n[root@vmoratest1 tmp]# rpm -ivh iozone-3-398.i386.rpm\nPreparing... \u00a0 \u00a0 \u00a0 \u00a0 \u00a0########################################### [100%]\n1:iozone \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0########################################### [100%]\n[root@vmoratest1 tmp]# whereis iozoneiozone\n\/opt\/iozone\/bin\/iozone<\/pre>\n<h3>Basic usage<\/h3>\n<p>Once installed, IOzone can be started in automatic mode simply using the command: iozone -a<\/p>\n<p>However, several options are available through iozone -h or in the documentation. We are going to present the most useful ones.<\/p>\n<ul>\n<li>Specify the file system to test:<\/li>\n<\/ul>\n<p style=\"padding-left: 30px;\"><span style=\"font-family: courier new,courier;\">iozone \/xxx\/yyy \u00a0 \u00a0 &#8212;&#8211;&gt; \u00a0 \u00a0iozone \/u01<\/span><\/p>\n<ul>\n<li>Specify the size of the file used for the tests:<\/li>\n<\/ul>\n<p style=\"padding-left: 30px;\"><span style=\"font-family: courier new,courier;\">iozone -s #k|#m|#g \u00a0 \u00a0&#8212;&#8211;&gt; \u00a0 iozone -s 10g \/u01<\/span><\/p>\n<ul>\n<li>Specify the size of the record used by IOzone<\/li>\n<\/ul>\n<p style=\"padding-left: 30px;\"><span style=\"font-family: courier new,courier;\">iozone -r #k|#m|#g \u00a0 \u00a0&#8212;&#8211;&gt; \u00a0 iozone -s 10g -r 8k \/u01<\/span><\/p>\n<p>The record is the slices in which the file will be divided during the tests. In case of an Oracle database benchmarking, the record size should be set to the db_block_size (or the tablespace block size, if it applies).<\/p>\n<ul>\n<li>Specify the tests to run<\/li>\n<\/ul>\n<p style=\"padding-left: 30px;\"><span style=\"font-family: courier new,courier;\">iozone -i test_id \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 &#8212;&#8211;&gt; \u00a0 iozone -i 0 -i 1 -s 10g -r 8k \/u01<\/span><\/p>\n<ul>\n<li>Specify the min and max number of thread to use: -l (lower) -u (upper)<\/li>\n<\/ul>\n<p style=\"padding-left: 30px;\"><span style=\"font-family: courier new,courier;\">iozone -l # -u # \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0&#8212;&#8211;&gt; \u00a0\u00a0iozone -i 0 -i 1 -l 1 -u 10 -s 10g -r 8k \/u01<\/span><\/p>\n<h3>IOzone output<\/h3>\n<p>By default, IOzone prints its output in a text format on the standard output:<\/p>\n<p><code><br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/standard_output.jpg\" alt=\"standard_output\" width=\"700\" height=\"391\" \/><\/code><\/p>\n<p>In addition, its results can be sent to an Excel or LibreOffice Calc File using:<\/p>\n<p style=\"padding-left: 30px;\"><strong><span style=\"font-family: courier new,courier;\">iozone -R -b file.xls iozone -R -b file.ods<\/span><\/strong><\/p>\n<p>Once the results are generated, some graphs can be generated using Calc or Excel.<br \/>\nBelow is an example meant to mesure the throughput (KB\/s) for each type of test, with different level of parallelization going from 2 to 10:<\/p>\n<p><span style=\"font-family: courier new,courier;\">[root@vmoratest1 current]# .\/iozone -R -b \/u01\/oradata\/bench_u01_test.xls -r 8k -s 100m -l 2 -u 10<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/Excel_output.png\" alt=\"Excel_output\" width=\"700\" height=\"634\" \/><\/p>\n<p>And here is a graph generated by these results:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/iozone_graph.png\" alt=\"iozone_graph\" width=\"800\" height=\"551\" \/><\/p>\n<p>Enjoy!\u00a0\ud83d\ude00<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Who never had to measure the disk performances on a system?<\/p>\n<p>Speaking about Linux performance monitoring includes a significant part on disk performances. If you are facing applications or databases running slower than expected or than on other environments, you may take a look on the I\/O performances.<br \/>This blog aims to provide to introduction to a pretty interesting tool, iozone&#8230;<\/p>\n","protected":false},"author":7,"featured_media":2537,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[42],"tags":[14,46,67,244],"type_dbi":[],"class_list":["post-2536","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-operating-systems","tag-i-o","tag-linux-unix","tag-performance","tag-workload"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Using IOzone for Linux disk performance analysis - dbi Blog<\/title>\n<meta name=\"description\" content=\"Need to perform some disk performance benchmarking? Have a look at this presentation of IOzone, an I\/O performance analysis tool.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/using-iozone-for-linux-disk-performance-analysis\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Using IOzone for Linux disk performance analysis\" \/>\n<meta property=\"og:description\" content=\"Need to perform some disk performance benchmarking? 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