The Total I/O data provided by the Performance Monitor is useful for monitoring the I/O activity of a specific controller and a specific logical drive, which can help identify possible high-traffic I/O areas.
Identify actual I/O patterns to the individual logical drives and compare those with the expectations based on the application. If a particular controller has considerably more I/O activity, consider moving logical drives to the other controller in the storage subsystem.
You might notice a disparity in the Total I/Os (workload) of controllers, for example, the workload of one controller is heavy or is increasing over time while that of the other controller is lighter or more stable. In this case, consider changing the controller ownership of one or more logical drives to the controller with the lighter workload. Use the logical drive Total I/O statistics to determine which logical drives to move.
Important: The controller owner of a Secondary Logical Drive in a Remote Mirror is determined by the controller owner of the Primary Logical Drive in the primary storage subsystem. If the controller owner of the Primary Logical Drive is Controller A, then the controller owner of the associated Secondary Logical Drive in the secondary storage subsystem is also Controller A. Controller ownership changes on the primary side automatically propagate to corresponding controller ownership changes on the secondary side.
Changing Controller Ownership of an Array or Logical Drive