Technical information

June 2012 Dell EqualLogic Configuration Guide v13.2 13
Figure 7 PS6100 Vertical Port Failover Process and Optimal Connection Paths
2.3.8 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 4 or Figure 5, 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.