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21.11.4.  Binding/Unbinding an iface to a Portal

Whenever iscsiadm is used to scan for interconnects, it will first check the iface.transport settings of each iface configuration in /var/lib/iscsi/ifaces. The iscsiadm utility will then bind discovered portals to any iface whose iface.transport is tcp.
This behavior was implemented for compatibility reasons. To override this, use the -I iface_name to specify which portal to bind to an iface, as in:
iscsiadm -m discovery -t st -p target_IP:port -I iface_name -P 1[7]
By default, the iscsiadm utility will not automatically bind any portals to iface configurations that use offloading. This is because such iface configurations will not have iface.transport set to tcp. As such, the iface configurations of Chelsio, Broadcom, and ServerEngines ports need to be manually bound to discovered portals.
It is also possible to prevent a portal from binding to any existing iface. To do so, use default as the iface_name, as in:
iscsiadm -m discovery -t st -p IP:port -I default -P 1
To remove the binding between a target and iface, use:
iscsiadm -m node -targetname proper_target_name -I iface0 --op=delete[9]
To delete all bindings for a specific iface, use:
iscsiadm -m node -I iface_name --op=delete
To delete bindings for a specific portal (e.g. for Equalogic targets), use:
iscsiadm -m node -p IP:port -I iface_name --op=delete


If there are no iface configurations defined in /var/lib/iscsi/iface and the -I option is not used, iscsiadm will allow the network subsystem to decide which device a specific portal should use.

[9] Refer to Section 21.12, “ Scanning iSCSI Interconnects” for information on proper_target_name.

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