Technical information

52 EqualLogic Configuration Guide | Version 15.2 | August 2014
Figure 15 PS6100 vertical port failover process and optimal connection paths
9.6 Vertical port failover behavior in PS4110/PS6110 controllers
In PS Series controllers prior to PS4110/6110 families, a link failure or a switch failure was not recognized
as a failure mode by the controller. This caused a failure of a link or an entire switch to reduce bandwidth
available from the array. Referring to Figure 12 or Figure 13, assume that CM0 is the active controller. In
vertical port failover, if CM0 senses a link drop on the local ETH0 port connection path, it will
automatically begin using the ETH0 port on the backup controller (CM1). 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.