Technical information

47 EqualLogic Configuration Guide | Version 15.2 | August 2014
Figure 10 Fully connected controller failover
9.4.2 Controller failover behavior for: PS41x0/PS61x0
In the event of a controller failure the following changes occur:
 The passive controller immediately activates and continues to process all data requests to the array.
 Vertical port failover ensures that IP addresses assigned to each of the failed controller Ethernet
ports apply to the corresponding ports on the second controller.
As stated in Section 9.4.1, controller models prior to the PS4100/PS6100 required having cabled
connections present on corresponding controller ports for controller failover to work correctly. The
vertical port failover feature in PS41x0/PS61x0 controllers eliminates this requirement, enabling partially
cabled configurations to support controller failover too.
It is important to ensure that ports from each controller are connected to at least two different switches.
This will prevent a switch failure from also disabling all paths between a host and its connected volumes.