Compaq ProLiant 8500 ProLiant Server Troubleshooting Guide - Page 274
WARNING - Drive Write, SOLUTION: This usually
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ADU Error Messages Table D-1: Array Diagnostic Utility (ADU) Error Messages continued Message Description Recommended Action Unknown disable code A code was returned from the array accelerator board that ADU does not recognize. Obtain the latest version of ADU. Unrecoverable read error Read parity errors were detected when an attempt to read the same data from both sides of the mirrored memory was made. Data loss will occur. Replace the array accelerator board. Warning bit detected A monitor and performance threshold violation may have occurred. The status of a logical drive may not be OK. Check the other error messages for an indication of the problem. WARNING - Drive Write Cache is enabled on X Drive has its internal write cache enabled. The drive may be a third-party drive, or the operating parameters of the drive may have been altered. Condition can cause data corruption if power to the drive is interrupted. Replace the drive with a supported drive, or restore the operating parameter of the drive. WARNING: Storage enclosure on SCSI bus X indicated it is operating in single ended mode. SOLUTION: This usually occurs when a single-ended drive type is inserted into an enclosure with other drive types; and that makes the entire enclosure operate in single ended mode. To maximize performance replace the single-ended drive with a type that matches the other drives. One or more single-ended mode SCSI drives are installed in an external storage unit that operates in low-voltage differential (LVD) mode. The array continues to operate, but installing all LVD drives maximizes performance. continued D-24 HP Servers Troubleshooting Guide