Cisco DS-X9530-SF1-K9 - Supervisor-1 Module - Control Processor Configuration Manual page 783

Chapter 35 Configuring iSCSI
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
iSCSI Initiator Idle Timeout
iSCSI initiator idle timeout specifies the time for which the virtual Fibre Channel N port is kept idle after
the initiator logs out from its last iSCSI session. The default value for this timer is 300 seconds. This is
useful to avoid N ports logging in to and logging off of the Fibre Channel SAN as transient failure occurs
in the IP network. This helps reduce unnecessary RSCNs being generated in the Fibre Channel SAN.
To configure the initiator idle timeout, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# iscsi initiator
idle-timeout 10
WWN Assignment for iSCSI Initiators
An iSCSI host is mapped to an N port's WWNs by one of the following mechanisms:
•
•
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 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.
Dynamic mapping is the default mode of operation.
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:
•
•
Tip
OL-6973-03, Cisco MDS SAN-OS Release 2.x
Dynamic mapping (default)
Static mapping
User assignment—You can specify your own unique WWN by providing them during the
configuration process.
System assignment—You can request that the switch should provide a WWN from the switch's Fibre
Channel WWN pool and keep the mapping in its configuration.
We recommend using the system-assign option. If you manually assign a WWN, you must
ensure its uniqueness (see the
should not use any previously-assigned WWNs.
Purpose
Enters configuration mode.
Configures the iSCSI initiators to have an idle timeout
value of 10 seconds.
"Configuring World Wide Names" section on page
Cisco MDS 9000 Family Configuration Guide
Configuring iSCSI
25-5). You
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