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Dell PowerVault ME4 Series Storage System CLI Guide

PDF

show redundancy-mode

Description Shows the redundancy status of the system.
Minimum role monitor
Syntax show redundancy-mode
Output Controller Redundancy Mode
Shows the system’s operating mode, also called the cache redundancy mode:
  • Independent Cache Performance Mode: For a dual-controller system, controller failover is disabled and data in a controller’s write-back cache is not mirrored to the partner controller. This improves write performance at the risk of losing unwritten data if a controller failure occurs while there is data in controller cache.
  • 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.
Controller Redundancy Status
  • Redundant with independent cache: Both controllers are operational but are not mirroring their cache metadata to each other.
  • Operational but not redundant: In active-active mode, one controller is operational and the other is offline. In single-controller mode, the controller is operational.
  • Redundant: Both controllers are operational.
  • Down: This controller is not operational.
  • Unknown: Status information is not available.
Controller ID Status
  • Operational: The controller is operational.
  • Down: The controller is installed but not operational.
  • Not Installed: The controller is not installed.
Controller ID Serial Number
  • Controller module serial number
  • Not Available: The controller is down or not installed.
Other MC Status
The operational status of the Management Controller in the partner controller. This is not factored into system health.
  • Operational
  • Not Operational
  • Not Communicating
  • Unknown
Examples Show the redundancy status of the system.

# show redundancy-mode
Basetypes

redundancy

status

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