Cisco MDS 9000 series Configuration Manual page 84

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 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 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.
Cisco MDS 9000 Family NX-OS IP Services Configuration Guide
4-12
Dynamic mapping (default)
Static mapping
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.
Purpose
Enters the configuration mode.
Configures the iSCSI initiators to have an idle timeout
value of 10 seconds.
OL-19525-01,Cisco MDS NX-OS Release 4.2(1)
Chapter 4 Configuring iSCSI