ORA-15029: disk 'string' is already mounted by this instance
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Answer / guest
Cause: An attempt was made to add to a diskgroup a disk that
was already mounted by the current instance as part of some
(possibly other) diskgroup.
Action: Specify a different disk in the command. Note that
not even the FORCE option can be used to correct the
situation until the diskgroup containing the disk becomes
dismounted by this instance.
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