Dell PowerEdge RAID Controller 5i - Manual (Page 73)

Troubleshooting
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Troubleshooting
To get help with your Dell™ PowerEdge™ Expandable RAID Controller (PERC) 5 controller, you can
contact your Dell Technical Service representative or access the Dell Support website at
support.dell.com.
Virtual Disks Degraded
A redundant virtual disk is in a degraded state when one physical disk has failed or is inaccessible. For
example, a RAID 1 virtual disk consisting of two physical disks can sustain one physical disk in a
failed or inaccessible state and become a degraded virtual disk.
To recover from a degraded virtual disk, rebuild the physical disk in the inaccessible state. Upon
successful 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 67
in "RAID Configuration and Management" on page 49.
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 firmware and do not disrupt
normal 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 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 firmware will discard the cache contents. The firmware will generate a warning
message 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 during
POST 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