RHEL 6 Storage Admin - 21.2. iSCSI

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21.2. iSCSI

This section describes the iSCSI API and the iscsiadm utility. Before using the iscsiadm utility, install the iscsi-initiator-utils package first; to do so, run yum install iscsi-initiator-utils.

In addition, the iSCSI service must be running in order to discover or log in to targets. To start the iSCSI service, run service iscsi start

21.2.1. iSCSI API

To get information about running sessions, run:

iscsiadm -m session -P 3

This command displays the session/device state, session ID (sid), some negotiated parameters, and the SCSI devices accessible through the session.

For shorter output (for example, to display only the sid-to-node mapping), run:

iscsiadm -m session -P 0

iscsiadm -m session

These commands print the list of running sessions with the format:

driver [sid] target_ip:port,target_portal_group_tag proper_target_name

For example:

iscsiadm -m session

      
tcp [2] 10.15.84.19:3260,2 iqn.1992-08.com.netapp:sn.33615311
tcp [3] 10.15.85.19:3260,3 iqn.1992-08.com.netapp:sn.33615311

For more information about the iSCSI API, refer to /usr/share/doc/iscsi-initiator-utils-version/README.