Release Notes

Building a high-availability SAN
49 Dell PS Series Configuration Guide
Vertical port failover is bi-directional. If CM1 is the active controller then vertical port failover will occur from
CM1 ports to CM0 ports if necessary.
PS4100 vertical port failover
PS6100 vertical port failover
With PS4100/PS6100 family controllers, vertical port failover can ensure continuous full bandwidth is
available from the array even if you have a link or switch failure. This is accomplished by combining
corresponding physical ports in each controller (vertical pairs) into a single logical port from the point of view
of the active controller. In a fully redundant SAN configuration, you must configure the connections as shown
in Section 9.2.
In a redundant switch SAN configuration, to optimize the system response in the event you have a vertical
port failover you must split the vertical port pair connections between both SAN switches. The connection
paths illustrated in Figure 14 and Figure 15 show how to alternate the port connection paths between the two
controllers. Also note how IP addresses are assigned to vertical port pairs.