Brocade iSCSI Gateway Service Administrator's Guide (53-1000603-01, October 2007)

4 iSCSI Gateway Service Administrator’s Guide
53-1000603-01
Overview of iSCSI gateway service
1
Presenting FC targets as iSCSI virtual targets
Fabric OS provides the following two methods to map physical FC targets (LUNs) to iSCSI virtual
targets (VTs):
• “Basic LUN mapping”
• “Advanced LUN mapping”
Basic LUN mapping
Fabric OS provides a mechanism that maps LUNs to iSCSI VTs, a one-to-one mapping with unique
iSCSI Qualified Names (IQNs) for each target. It presents an iSCSI VT for each native FC target to
the IP network and an iSCSI VI for each iSCSI port to the FC fabric.
The following figure shows the result of using the iscsiCfg - -easycreate tgt command executed on
an FC target with four LUNs. See “Configuring the GbE interface” on page 15.
FIGURE 4 iSCSI VT basic LUN mapping
Advanced LUN mapping
SCSI VTs can be mapped to more than one physical FC target, and the LUNs can be mapped to
different virtual LUNs. The following figure shows an advanced mapping scenario.
iS CSI v irtu al ta rget (V T)
2
3
0
1
LUN
FC target
2
3
0
1
LUN
40. 9