Leds - Dell EMC ME4084 Owner's Manual

• Critical. A failure occurred that may cause a controller to shut down. Correct the problem immediately.
• Error. A failure occurred that may affect data integrity or system stability. Correct the problem as soon as possible.
• Warning. A problem occurred that may affect system stability, but not data integrity. Evaluate the problem and correct it if necessary.
• Informational. A configuration or state change occurred, or a problem occurred that the system corrected. No immediate action is
required.
The event logs record all system events. It is very important to review the logs, not only to identify the fault, but also to search for events
that might have caused the fault to occur. For example, a host could lose connectivity to a disk group if a user changes channel settings
without taking the storage resources assigned to it into consideration. In addition, the type of fault can help you isolate the problem to
either hardware or software.
Isolate the fault
Occasionally, it might become necessary to isolate a fault. This is particularly true with data paths, due to the number of components
comprising the data path. For example, if a host-side data error occurs, it could be caused by any of the components in the data path:
controller module, cable, or data host.
If the enclosure does not initialize
It may take up to two minutes for all enclosures to initialize. If an enclosure does not initialize:
• Perform a rescan
• Power cycle the system
• Make sure the power cable is properly connected, and check the power source to which it is connected
• Check the event log for errors
Correcting enclosure IDs
When installing a system with drive enclosures attached, the enclosure IDs might not agree with the physical cabling order. This is because
the controller might have been previously attached to enclosures in a different configuration, and it attempts to preserve the previous
enclosure IDs, if possible. To correct this condition, make sure that both controllers are up, and perform a rescan using the ME Storage
Manager or the CLI. This will reorder the enclosures, but can take up to two minutes for the enclosure IDs to be corrected.
To perform a rescan using the CLI, type the following command:
rescan
To perform a rescan using the ME Storage Manager:
1. Verify that both controllers are operating normally.
2. Do one of the following:
• Select the System tab and click Rescan Disk Channels.
• In the System topic. select Action > Rescan Disk Channels.
3. Click Rescan.
NOTE: The reordering enclosure IDs action only applies to dual-controller mode. If only one controller is available, due to
either single-controller configuration, or controller failure, a manual rescan will not reorder the drive enclosure IDs.

LEDs

LED colors are used consistently throughout the enclosure and its components for indicating status:
• Green – Good or positive indication
• Blinking green/amber – Non-critical condition
• Amber – Critical fault
• Blue – Controller module or IOM identification
30 Troubleshooting and problem solving