Dell PowerVault ME5 Series Storage System CLI Reference Guide

The operating mode of the system, also called the cache redundancy mode.

• Active-Active ULP: Both controllers are active using ULP (Unified LUN Presentation). Data for volumes configured to use write-back cache is automatically mirrored between the two controllers to provide fault tolerance.
• Single Controller: The enclosure contains a single controller.
• Failed Over: Operation has failed over to one controller because its partner is not operational. The system has lost redundancy.
• Down: Both controllers are not operational.

Numeric equivalents for operation-mode values.

• 2: Active-Active ULP
• 3: Single Controller
• 4: Failed Over
• 5: Down