Answer / guest

Cause: The diskgroup is being dismounted by request or
because an I/O error was encountered that could not be
handled by taking the disks offline. A disk cannot be
offlined whenever doing so could result in all copies of a
redundant extent being unavailable.

Action: Repair the hardware problem and re-mount the
diskgroup. Refer to the alert log to determine which disks
have failed.

Please add more information about this Error

ORA-39064: unable to write to the log file

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ORA-14637: cannot merge a subpartition with itself

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