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50-17
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 50 Configuring iSCSI
Configuring iSCSI
Step 2 Click the Globals tab.
You see the iSCSI global configuration.
Step 3 Right-click on the InitiatorIdle Timeout field that you want to modify and enter the new timeout value.
Step 4 Click the Apply Changes icon to save these changes.
WWN Assignment for iSCSI Initiators
An iSCSI host is mapped to an N port’s WWNs by one of the following mechanisms:
• Dynamic mapping (default)
• Static mapping
Dynamic Mapping
With dynamic mapping, an iSCSI host is mapped to a dynamically generated port WWN (pWWN) and
node WWN (nWWN). Each time the iSCSI host connects it might be mapped to a different WWN. Use
this option if no access control is required on the Fibre Channel target device (because the target device
access control is usually configured using the host WWN).
The WWNs are allocated from the MDS switch's WWN pool. The WWN mapping to the iSCSI host is
maintained as long as the iSCSI host has at least one iSCSI session to the IPS port. When all iSCSI
sessions from the host are terminated and the IPS module or MPS-14/2 module performs an FLOGO for
the virtual N port of the host, the WWNs are released back to the switch's Fibre Channel WWN pool.
These addresses are then available for assignment to other iSCSI hosts requiring access to the Fibre
Channel Fabric.
The following are three dynamic initiator modes are supported:
• iSCSI—Dynamic initiators are treated as iSCSI initiators and can access dynamic virtual targets and
configured iSCSI virtual targets.
• iSLB—Dynamic initiators are treated as iSLB initiators.
• Deny—Dynamic initiators are not allowed to log in to the MDS switch.
iSCSI dynamic mapping is the default mode of operation. This configuration is distributed using CFS.
Note Configuring dynamic initiator modes is supported only through the CLI, not through Device Manager or
Fabric Manager.
Static Mapping
With static mapping, an iSCSI host is mapped to a specific pWWN and nWWN. This mapping is
maintained in persistent storage and each time the iSCSI host connects, the same WWN mapping is used.
This mode is required if you use access control on the target device.
You can implement static mapping in one of two ways:
• User assignment—You can specify your own unique WWN by providing them during the
configuration process.
• System assignment—You can request that the switch provide a WWN from the switch’s Fibre
Channel WWN pool and keep the mapping in its configuration.
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