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118 Troubleshooting
Memory Errors
Memory errors can corrupt cached data, so the controllers are designed to detect
and attempt to recover from these 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 an access to data in cache memory causes a multi-bit error 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 internal event log and logs
a message during POST indicating that a multi-bit error has occurred.
NOTE: In case of a multi-bit error, contact Dell Technical Support.
Pinned Cache State
If a virtual disk becomes offline or is deleted because of missing physical
disks, the controller preserves the dirty cache from the virtual disk. This
preserved dirty cache is called pinned cache and is preserved until you import
the virtual disk, or discard the cache.
Use the Ctrl+R utility to select whether to import the virtual disk or discard
the pinned cache. In the VD Mgmt menu, select Manage Preserved Cache
and follow the steps on the screen.
Dell_PERC6.1_UG.book Page 118 Wednesday, April 15, 2009 4:18 PM