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vsi_connect_iscsi.md

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2017-04-27

{:shortdesc: .shortdesc} {:codeblock: .codeblock} {:screen: .screen} {:new_window: target="_blank"} {:pre: .pre} {:table: .aria-labeledby="caption"}

Connecting to an iSCSI LUN in Linux for CentOS/RHEL 7

{: #connecting-iscsi}

To interact with an iSCSI LUN in Linux-based operating systems, you must connect to the LUN by entering a series of commands in the terminal based on the operating system being used to perform the interactions. The tool used to interact with an iSCSI LUN in a Linux-based OS is dependent upon the type and version of the OS installed on the device. {:shortdesc}

CentOS 7 and RHEL 7

  1. Install iscsi-initiator and multipath mapper for Linux.

    yum -y install iscsi-initiator-utils device-mapper device-mapper-multipath

    {: codeblock}

  2. Create the iscsid.conf configuration file.

  3. Backup the original configuration.

    cp /etc/iscsi/iscsid.conf{,.save}

    {: codeblock}

  4. Open the /etc/iscsi/iscsid.conf file with a text editor and replace the contents with the following information.

    node.startup = automatic
node.session.auth.username = ISCSI_USER
node.session.auth.password = ISCSI_PASS
discovery.sendtargets.auth.username = ISCSI_USER
discovery.sendtargets.auth.password = ISCSI_PASS
node.session.timeo.replacement_timeout = 120
node.conn[0].timeo.login_timeout = 15
node.conn[0].timeo.logout_timeout = 15
node.conn[0].timeo.noop_out_interval = 10
node.conn[0].timeo.noop_out_timeout = 15
node.session.iscsi.InitialR2T = No
node.session.iscsi.ImmediateData = Yes
node.session.iscsi.FirstBurstLength = 262144
node.session.iscsi.MaxBurstLength = 16776192
node.conn[0].iscsi.MaxRecvDataSegmentLength = 65536

    {: codeblock}

  5. Start iscsid.

     /etc/init.d/iscsi start

    {: codeblock}

  6. Run a discovery against the iscsi target host.

    iscsiadm -m discovery -t sendtargets -p [IP Address in StorageLayer]

    {: codeblock}

  7. Connect to the iscsi target host.

    iscsiadm -m node -T [output from above starting with iqn.] -p [IP Address in storagelayer] -l

    {: codeblock}

  8. Restart the iscsi service (Since node.startup was set to automatic in iscsid.conf it will automatically login to the target host).

     /etc/init.d/iscsi restart

    {: codeblock}