Brocade Fabric OS Administrator's Guide Supporting Fabric OS v6.3.0 (53-1001336-02, November 2009)

Fabric OS Administrator’s Guide 259
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iSCSI gateway service overview
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FIGURE 31 iSCSI-to-FC translation
Basic and advanced LUN mapping
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 a basic LUN mapping scenario for an FC target with four LUNs.
FIGURE 32 iSCSI VT basic LUN mapping
Advanced LUN mapping
iSCSI 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 C S I gateway s ervic e
Storage
(device s e rver)
SCSI
FCP
FC
FC target
Applicat ion
SCSI
iS C S I
TCP/IP
iS CS I in itia tor
FCP (FC-4)
FC (FC-2/FC-3)
iS C S I
TCP/IP
iS CS I v irtual
initiato r (V I)
iS CS I v irtual
target (VT)
40. 3
iS CS I v irtual targe t (V T)
2
3
0
1
LUN
FC target
2
3
0
1
LUN
40. 9