Installation guide
iSCSI
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lpfc qla2xxx zfcp mptfc
Host issue_lip X X
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Supported as of Red Hat Enterprise Linux 5.4
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Supported as of Red Hat Enterprise Linux 6.0
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
or
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.
21.3. Persistent Naming
The operating system issues I/O to a storage device by referencing the path that is used to reach it.
For SCSI devices, the path consists of the following:
• PCI identifier of the host bus adapter (HBA)
• channel number on that HBA
• the remote SCSI target address