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Event ID: 509 Source: NTDSISAM

NTDS (<PID>) NTDSA: A request to write to the file "<file>" at offset <offset> (<offset>) for <value> (<value>) bytes succeeded but took an abnormally long time (<value> seconds) to be serviced by the OS. In addition <value> other I/O requests to this file have also taken an abnormally long time to be serviced since the last message regarding this problem was posted <value> seconds ago. This problem is likely due to faulty hardware. Please contact your hardware vendor for further assistance diagnosing the problem.
This error occurred when a physical drive failed in a SCSI RAID array. The performance of the array decreased significantly until the raid controller finished rebuilding the array using an online spare; therefore, Active Directory had a difficult time writing to the database. Rebuilding the array solved this issue.

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