Connect to the iSCSI targets by Open-iSCSI Initiator on Ubuntu Linux

This section shows you how to use Linux Open-iSCSI Initiator on Ubuntu to add the iSCSI target (QNAP NAS) as an extra partition. Before you start to use the iSCSI target service, make sure you have created an iSCSI target with a LUN on the NAS and installed the correct iSCSI initiator for your OS.


About Linux Open-iSCSI Initiator The Linux Open-iSCSI Initiator is a built-in package in Ubuntu 8.04 LTS (or later). You can connect to an iSCSI volume at a shell prompt with just a few commands. More information about Ubuntu is available at and for information and download location of Open-iSCSI, please visit:


Before you start Install the open-iscsi package. The package is also known as the Linux Open-iSCSI Initiator.


# sudo apt-get install open-iscsi


Now follow the steps below to connect to an iSCSI target (QNAP NAS) with Linux Open-iSCSI Initiator.

You may need to modify the iscsid.conf for CHAP logon information, such as node.session.auth.username & node.session.auth.password.

# vi /etc/iscsi/iscsid.conf


Save and close the file, then restart the open-iscsi service.

# /etc/init.d/open-iscsi restart


Discover the iSCSI targets on a specific host (the QNAP NAS in this example), for example, with default port 3260.

# iscsiadm -m discovery -t sendtargets -p


Check the available iSCSI node(s) to connect.

# iscsiadm -m node


** You can delete the node(s) you do not want to connect to when the service is on with the following command:

# iscsiadm -m node –op delete –targetname THE_TARGET_IQN


Restart open-iscsi to login all the available nodes.

# /etc/init.d/open-iscsi restart


You should be able to see the login message as below:

Login session [iface: default, target:, portal:,3260] [ OK ]


Check the device status with dmesg.

# dmesg | tail


Enter the following command to create a partition, /dev/sdb is the device name.

# fdisk /dev/sdb


Format the partition.

# mkfs.ext3 /dev/sdb1


Mount the file system.

# mkdir /mnt/iscsi


# mount /dev/sdb1 /mnt/iscsi/


You can test the I/O speed using the following command.

# hdparm -tT /dev/sdb1


Below are some “iscsiadm” related commands.

Discover the targets on the host:

# iscsiadm -m discovery –type sendtargets –portal HOST_IP


Login a target:

# iscsiadm –m node –targetname THE_TARGET_IQN –login


Logout a target:

# iscsiadm –m node –targetname THE_TARGET_IQN –logout


Delete a Target:

# iscsiadm –m node –op delete –targetname THE_TARGET_IQN


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