Data Replication Manager Windows-Based Server with Single Host Bus Adapter - Application Notes

Solution Behavior
8 Application Notes – Data Replication Manager Windows-Based Server with Single Host Bus Adapter
Failure of Cable Between FC Switch and HSG80 Host Port 1 (Left Port)
at Local Site
In this case, Secure Path detects that the path is broken and selects an alternate path. When the broken
path is repaired, the units that are on the alternate controller (drives K and M in Figure 4) fail back to
the original controller.
Figure 4: Secure Path Manager view of host port 1 cable failure
Failure of Cable Between FC Switch and HSG80 Host Port 2 (Right Port)
at Local Site
In this case, the HSG80 controller that has lost contact with the FC switch detects that it cannot
communicate with its peer HSG80 controller on the other site. This detection may take up to 25
seconds. When detected, the units fail over to the other controller in the same HSG80 pair and I/O
processing continues. This situation is shown in Figure 5.
Figure 5: Secure Path Manager view of host port 2 cable failure