Dell EMC ME4 Series - Page 125

Number Severity Description/Recommended actions
• No action is required.
542 Critical A data block was fenced by the controller due to lost data.
Event 543 will also be logged to describe volume information for the fenced data block.
Recommended actions:
• Perform recovery procedures, which may include restoring from backups.
543 Critical A data block in a volume was fenced by the controller due to lost data.
This event describes volume information for a fenced data block. It is logged in conjunction with event 542,
which describes disk group and disk information for the data block.
Recommended actions:
• Perform recovery procedures, which may include restoring from backups.
545 Warning A controller module is connected to a legacy enclosure midplane, resulting in degraded performance.
Recommended actions:
• To achieve better performance, replace the enclosure’s legacy chassis FRU with the latest version of the
FRU.
546 Error The controller that logged this event killed the partner controller which has an incompatible host port
conguration.
Recommended actions:
• Replace the killed controller module with a controller module that has the same host port conguration as
the surviving controller module.
548 Warning Disk group reconstruction failed.
When a disk fails, reconstruction is performed using a spare disk. In this case, the reconstruction operation
failed because unreadable data (uncorrectable media error) exists in at least one other disk in the disk group.
Because of this, a portion of the data cannot be reconstructed.
Recommended actions:
• If you do not have a backup copy of the data in the disk group, make a backup.
• Note the conguration of the disk group, such as its size and host mappings.
• Look for another event logged at approximately the same time that indicates a disk failure, such as event
8, 55, 58, or 412. Follow the recommended actions for that event.
• Remove the disk group.
• Re-add the disk group.
• Restore the data from the backup to a new disk group.
549 Critical The indicated controller module detected that it recovered from an internal processor fault.
Recommended actions:
• Replace the controller module.
550 Critical The read data path between the Storage Controller and the disk drives was detected to be unreliable. The
Storage Controller took action to correct this.
Recommended actions:
• Replace the controller.
Events and event messages 125