SafeGuard Solutions Deploying Brocade AP-7600B and PB-48K ...

Multi-VI and frame
redirect modes
The Unisys SafeGuard Solutions SAS agent on AP7600B or
PB-48K-AP4-18 platforms can be deployed in either frame redirect or
multi-VI mode.
Multi-VI mode will impact the existing fabric in the following ways:
◆ LUN mapping must now direct the LUNs to the virtual initiators
instead of the host initiators.
◆ Zoning must be completely reorganized.
Unisys SafeGuard Solutions can use the frame redirect capabilities of
the AP-7600B and PB-48K-AP4-18 to alleviate the need for much of
the reconfiguration.
When frame redirect is enabled, the name server deliberately gives
“misleading” answers to FCID queries that are generated by the host
and target. As a result, host initiators send writes that are directed to
the storage targets to the virtual targets, and storage targets see writes
that come from the virtual initiators as if they are coming from the
host initiators themselves.
Figure 1 on page 7 shows an environment in which the storage target
with WWN W1 and FCID F1 is exposing LUNs to the host initiator
with WWN W2 and FCID F2.
6 Unisys SafeGuard Solutions Deploying Brocade AP-7600B and PB-48K-AP4-18 Devices Technical Notes