Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual page 1055

Chapter 43 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
Transparent Initiator Mode
Each iSCSI host is presented as one virtual Fibre Channel host (that is, one Fibre Channel N port). The
benefit of transparent mode is it allows a finer-level of Fibre Channel access control configuration.
Because of the one-to-one mapping from iSCSI to Fibre Channel, each host can have different zoning or
LUN access control on the Fibre Channel storage device.
When an iSCSI host connects to the IPS module or MPS-14/2 module, a virtual host N port (HBA port)
is created for the host (see
Port WWN.
Figure 43-10
host A
iSCSI iSCSI
host B
iSCSI iSCSI
host C
iSCSI iSCSI
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:
•
•
•
•
•
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
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.
OL-18084-01, Cisco MDS NX-OS Release 4.x
Figure
Virtual Host HBA Port
MDS
IP Network
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.
43-10). Every Fibre Channel N port requires a unique Node WWN and
Virtual
FC host A
Virtual
FC host B
Target
Virtual
FC host C
Figure 43-10, there are three iSCSI hosts and all three of them
Cisco MDS 9000 Family CLI Configuration Guide
T-1
Configuring iSCSI
43-11