Technical information

44 EqualLogic Configuration Guide | Version 15.2 | August 2014
Figure 7 Redundant SAN Connection Paths: PS4100
Figure 8 Redundant SAN Connection Paths: PS4110/PS6110
9.3 Controller redundancy in all models
Each array can be configured with either a single controller, or dual redundant controllers. The single
controller configuration will provide the same level of I/O performance as a dual controller configuration.
The dual controller configuration provides for redundancy. Dual controllers provide redundancy in the
case of a controller failure. Host connections will fail over to the redundant controller.
The Active Controller is the controller which is processing all disk and network I/O operations for the
array. A second controller in dual controller configurations will always be in a passive operating mode. In
this mode, the secondary controller will exhibit the following characteristics: