Troubleshooting 71TroubleshootingTo get help with your Dell™ PowerEdge™ Expandable RAID Controller (PERC) 5 controller, you cancontact your Dell Technical Service representative or access the Dell Support website atsupport.dell.com.Virtual Disks DegradedA redundant virtual disk is in a degraded state when one physical disk has failed or is inaccessible. Forexample, a RAID 1 virtual disk consisting of two physical disks can sustain one physical disk in afailed or inaccessible state and become a degraded virtual disk.To recover from a degraded virtual disk, rebuild the physical disk in the inaccessible state. Uponsuccessful completion of the rebuild process, the virtual disk state changes from degraded to optimal.For the rebuild procedure, see "Performing a Manual Rebuild of an Individual Physical Disk" on page 67in "RAID Configuration and Management" on page 49.Memory ErrorsMemory errors can corrupt cached data, so the controllers are designed to detect and attempt to recoverfrom these memory errors. Single-bit memory errors can be handled by the firmware and do not disruptnormal operation. A notification will be 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 theactions 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 withdirty cache, the firmware will discard the cache contents. The firmware will generate a warningmessage to the system console to indicate that the cache was discarded and will generate an event.• If a multi-bit error occurs at run-time either in code/data or in the cache, the firmware will stop.• The firmware will log an event to the firmware internal event log and will log a message duringPOST indicating that a multi-bit error has occurred.NOTE: In case of a multi-bit error, contact Dell Technical Support.Dell_PERC5_UG.book Page 71 Tuesday, February 13, 2007 6:02 PM
