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Dell PowerVault ME4 Series Storage System CLI Guide

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show controllers


Description	Shows information about each controller module.
Minimum role	monitor
Syntax	show controllers
Output	Controller module ID: A or B. Serial Number Serial number. Not Available: The controller module is down or not installed. Hardware Version Hardware version. CPLD Version Complex Programmable Logic Device firmware version. MAC Address Network port MAC address. WWNN Storage system World Wide Node Name (WWNN). IP Address Network port IP address. IP Subnet Mask Network port IP subnet mask. IP Gateway Network port gateway IP address. Disks Number of disks in the storage system. Virtual Pools Number of virtual pools in the storage system. Vdisks (v2) Disk Groups (v3) Number of disk groups in the storage system. System Cache Memory (MB) Controller module cache memory size, in MB, including CPU memory available to I/O. Host Ports Number of host ports in the controller module. Disk Channels Number of expansion ports in the controller enclosure. Disk Bus Type Type of interface between the controller module and disks: SAS Status Operational Down Not Installed Failed Over to This Controller Indicates whether the partner controller has failed over to this controller: No: The partner controller has not failed over to this controller. Yes: The partner controller has either failed or been shut down, and its responsibilities have been taken over by this controller. There will be a delay between the time that the value of Status becomes Down for one controller and the time that the value of Failed Over to This Controller becomes Yes for the other controller. This time period is the time that it takes for a controller to take over the responsibilities of its partner. Fail Over Reason If Failed Over to This Controller is Yes, a reason for the failover appears; otherwise, Not applicable appears. Multi-core Shows whether the controller module is using multiple processing cores. Enabled: Multiple cores are active. Disabled: A single core is active. Health OK Degraded Fault N/A Unknown Health Reason If Health is not OK, this field shows the reason for the health state. Health Recommendation If Health is not OK, this field shows recommended actions to take to resolve the health issue. Position Position of the controller in the enclosure: Left: The controller is in the left slot. Right: The controller is in the right slot. Top: The controller is in the top slot. Bottom: The controller is in the bottom slot. Phy Isolation Shows whether the automatic disabling of SAS expander PHYs having high error counts is enabled or disabled for this controller. Enabled: PHY fault isolation is enabled. Disabled: PHY fault isolation is disabled. 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. Redundant: Both controllers are operational. 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. Down: This controller is not operational. Unknown: Status information is not available.
Examples	Show controller information. # show controllers
Basetypes	controllers status
See also	show configuration show frus