Fabric OS Administrator's Guide v7.0.0 (53-1002148-02, June 2011)

464 Fabric OS Administrator’s Guide
53-1002148-02
Fibre Channel routing concepts
23
FIGURE 74 A metaSAN with inter-fabric links
• Logical SANs (LSANs)
An LSAN is defined by zones in two or more edge or backbone fabrics that contain the same
devices. You can create LSANs that span fabrics. These LSANs enable Fibre Channel zones to
cross physical SAN boundaries without merging the fabrics while maintaining the access
controls of zones.
An LSAN device can be a physical device, meaning that it physically exists in the fabric, or it can
be a proxy device.
Figure 75 on page 465 shows a metaSAN with a backbone consisting of one FC router
connecting hosts in edge fabrics 1 and 3 with storage in edge fabric 2 and the backbone fabric
through the use of LSANs. Three LSAN zones allow device sharing between the backbone
fabric and Edge Fabric 1, between Edge Fabric 1 and Edge Fabric 2, and between Edge Fabric
2 and Edge Fabric 3.
Edge
fabric 2
Host Target
Target
Edge
fabric 1
Edge
fabric 3
Fibre
Channel
switch
E_Port
E_Port
E_Port
EX_Ports
IFL
IFL
FC router
Long distance IFL
Fibre
Channel
switch
Edge
fabric 2
Host Target
Target
Edge
fabric 1
Edge
fabric 3
Fibre
Channel
switch
E_Port
E_Port
E_Port
EX_Ports
IFL
IFL
FC router
Long distance IFL
Fibre
Channel
switch