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50-16
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 50 Configuring iSCSI
Configuring iSCSI
Figure 50-17 Virtual Host HBA Port
After the virtual N port is created with the WWNs, a fabric login (FLOGI) is done through the virtual
iSCSI interface of the IPS port. After the FLOGI is completed, the virtual N port is online in the Fibre
Channel SAN and virtual N port is registered in the Fibre Channel name server. The IPS module or
MPS-14/2 module registers the following entries in the Fibre Channel name server:
• IP address of the iSCSI host in the IP-address field on the name server
• IQN of the iSCSI host in the symbolic-node-name field of the name server
• SCSI_FCP in the FC-4 type field of the name server
• Initiator flag in the FC-4 feature of the name server
• Vendor-specific iSCSI GW flag in the FC-4 type field to identify the N-port device as an iSCSI
gateway device in the name server.
When all the iSCSI sessions from the iSCSI host are terminated, the IPS modules or MPS-14/2 modules
perform an explicit Fabric logout (FLOGO) to remove the virtual N-port device from the Fibre Channel
SAN (this indirectly de-registers the device from the Fibre Channel name server).
For every iSCSI session from the host to the iSCSI virtual target there is a corresponding Fibre Channel
session to the real Fibre Channel target. In
Figure 50-17, there are three iSCSI hosts and all three of them
connect to the same Fibre Channel target. There is one Fibre Channel session from each of the three
virtual Fibre Channel hosts to the target.
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 using Fabric Manager, follow these steps:
Step 1 Choose End Devices > iSCSI in the Physical Attributes pane.
You see the iSCSI tables in the Information pane (see Figure 50-5).
iSCSIiSCSI
host B
iSCSIiSCSI
host A
iSCSIiSCSI
host C
MDS
Virtual
FC host A
Virtual
FC host B
Virtual
FC host C
Target
T- 1
120876
IP Network
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