{"id":2783,"date":"2010-12-10T09:45:11","date_gmt":"2010-12-10T09:45:11","guid":{"rendered":"http:\/\/blog.open-e.com\/?p=2783"},"modified":"2025-07-03T08:45:05","modified_gmt":"2025-07-03T08:45:05","slug":"shared-storage-for-linux-servers-quickly-and-painlessly","status":"publish","type":"post","link":"https:\/\/www.open-e.com\/blog\/shared-storage-for-linux-servers-quickly-and-painlessly\/","title":{"rendered":"Shared storage for Linux servers &#8211; quickly and painlessly"},"content":{"rendered":"<p>\t\t\t\tHow to provide access to shared data using Linux based servers and cluster file system? In this post we are going to present quick and painless way to configure the whole environment that will consist of a few servers using Linux Debian Squeeze and another one with DSS V6 as a storage provider. To be more interesting we are going to present also an alternative way to manage DSS V6.<br \/>\n<!--more--><\/p>\n<p>Suppose you have several servers based on Linux Debian Squeeze. You want to provide some storage for these servers, which e.g. can be used to store application data shared between servers (e.g. some static data). For this purpose you can use the DSS V6 as a software specializing in storage management. You can easily export data via iSCSI Target and using your servers based on Debian Squeeze import them via iSCSI Initiator.<\/p>\n<p><b>1. Creating iSCSI Target<\/b><\/p>\n<p>This step represents creating <a title=\"iscsi target and dss v6\" href=\"https:\/\/www.open-e.com\/solutions\/how-connect-to-dss-v6-iscsi-target-volume-from-microsoft-windows\/\">iSCSI Target using Open-E DSS V6<\/a>. Alternative to GUI way to manage DSS V6 is to use SSH access channel. It can help achieve the automation of system management as well as allows you to perform an action on the DSS V6 system when it is not possible to use graphical environment. To activate this channel, go to <em>SETUP-&gt;administrator-&gt;API Configuration<\/em>, enable and configure it according to your preferences (by specifying the destination port to connect to the service, password, allowed IP address or generate a key that will allow you authentication without password for this service). When you activate this option, use command <em>ssh<\/em> in order to create iSCSI logical volume and export it via iSCSI Target.<\/p>\n<ul>\n<li>create iSCSI logical volumessh api@192.168.2.14 -p 22223 &#8216;create_iscsilv vg00 32 blockio&#8217;<br \/>\nlv0000<\/li>\n<li>create iSCSI Targetssh api@192.168.2.14 -p 22223 &#8216;iscsi_target_create mytarget&#8217;<\/li>\n<li>assign iSCSI logical volume to iSCSI Targetssh api@192.168.2.14 -p 22223 &#8216;iscsi_target_assign mytarget lv0000&#8217;<br \/>\nlv0000:mytarget:0:wt:RwksJaO0ZYkak8Xo<\/li>\n<\/ul>\n<p><b>NOTE<\/b>: All available commands for SSH channel you can get using the command \u2018help\u2019. In addition for each command you can use the &#8216;-h&#8217; parameter to get more details.<\/p>\n<p><b>2. Configuring Debian Squeeze servers<\/b><\/p>\n<p>At this stage we will need the iSCSI Initiator (<em>Open-iSCSI<\/em>) and cluster file system (<em>ocfs2<\/em>).<\/p>\n<ul>\n<ul>\n<li>necessary software you can install using following command:apt-get install open-iscsi ocfs2-tools<\/li>\n<li>connecting to iSCSI Target (this step has to be performed on all servers):iscsiadm -m discovery -t st -p 192.168.2.14<br \/>\n192.168.2.14:3260,1 mytarget<\/p>\n<p>iscsiadm -m node -T mytarget -p 192.168.2.14 &#8211;login<br \/>\nLogging in to [iface: default, target: mytarget, portal: 192.168.2.14,3260]<br \/>\nLogin to [iface: default, target: mytarget, portal: 192.168.2.14,3260]: successful<\/p>\n<p><b>NOTE<\/b>: To ensure automatic connection iSCSI Initiator to iSCSI Target at Open-iSCSI service startup (de facto at the server startup) you can set option <em>node.startup<\/em> with value <em>automatic<\/em> in the configuration of this target. You can do this by<em> iscsiadm -m node -T mytarget &#8211;op update -n node.startup -v automatic<\/em> where <em>mytarget<\/em> is the name of the iSCSI Target (you can set this option globally for all targets in<em> \/etc\/iscsi\/iscsid.conf<\/em> configuration file).<\/li>\n<li>configuring ocfs2 cluster file system (this step has to be performed on all servers):The next step is to configure <em>ocfs2<\/em>. It is very simple and bases on a configuration file <em>\/etc\/ocfs2\/cluster.conf<\/em>, which should be placed on all nodes. It may have the following content (assuming our two-node configuration):node:<br \/>\nip_port = 7777<br \/>\nip_address = 192.168.2.8<br \/>\nnumber = 0<br \/>\nname = node-first<br \/>\ncluster = ocfs2<\/p>\n<p>node:<br \/>\nip_port = 7777<br \/>\nip_address = 192.168.2.9<br \/>\nnumber = 1<br \/>\nname = node-second<br \/>\ncluster = ocfs2<\/p>\n<p>cluster:<br \/>\nnode_count = 2<br \/>\nname = ocfs2<\/li>\n<li>in next step we will ensure that <em>o2cb<\/em> service starts at system boot. You can make it through <em>dpkg-reconfigure ocfs2-tools<\/em>. Then (assuming that <em>o2cb<\/em> service is running) format your device that will be used to store common data using <em>mkfs.ocfs2<\/em> command (e.g. <em>mkfs.ocfs2 \/dev\/sdb<\/em>, assuming that \/dev\/sdb is external device connected via iSCSI Initiator) and mount it on all nodes (<em>mount \/dev\/sdb \/mnt\/common<\/em>).Optionally you can set an entry in <em>\/etc\/fstab<\/em>:\/dev\/sdb \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/mnt\/common \u00a0\u00a0\u00a0 ocfs2 \u00a0\u00a0defaults \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 \u00a0\u00a0\u00a0\u00a0\u00a0 0\n<p>that will be responsible for automatic device mount at system boot.<\/li>\n<\/ul>\n<\/ul>\n<p><b>NOTE<\/b>: I&#8217;ve noticed some problems with script boot sequence in <em>rcS.d<\/em>. I&#8217;ve changed LSB header dependencies for scripts <em>\/etc\/init.d\/ocfs2<\/em> and <em>\/etc\/init.d\/o2cb<\/em> &#8211; now they have <b>open-iscsi<\/b> in <em>Required-Start<\/em> field. After changing it I&#8217;ve ran <em>insserv<\/em> command which caused reordering scripts in <em>rcS.d<\/em> directory and correct service start at system boot.<\/p>\n<p>In this way we have gone through the configuration of all servers &#8211; good luck!\t\t<\/p>\n","protected":false},"excerpt":{"rendered":"<p>How to provide access to shared data using Linux based servers and cluster file system? In this post we are going to present quick and painless way to configure the&nbsp;&#8230;<\/p>\n","protected":false},"author":5,"featured_media":55804,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[18,777,765],"tags":[228,349,374],"class_list":["post-2783","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hardware","category-iscsi","category-open-e-legacy-products","tag-dss-v6","tag-iscsi","tag-linux"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Recipe for building shared storage for Linux based servers using Open-E DSS V6 storage management software. 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