Dell PowerEdge RAID Controller 9 User’s Guide H330, H730, and H830

Memory errors can corrupt cached data, so the controllers are designed to detect and attempt to recover from the memory errors. Single-bit memory errors can be handled by the controller and do not disrupt normal operation. A notification is sent if the number of single-bit errors exceeds a threshold value.

Multi-bit errors are more serious as they result in corrupted data and data loss. The following are the actions that occur in the case of multi-bit errors:

• If a multi-bit error occurs while accessing data in the cache when the controller is started with dirty cache, the controller discards the cache contents. The controller generates a warning message to the system console to indicate that the cache was discarded and generates an event.
• If a multi-bit error occurs at run-time either in code/data or in the cache, the controller stops.
• The controller logs an event to the controller’s internal event log and a message during POST is displayed indicating a multi-bit error has occurred.