ORA-15033: disk belongs to diskgroup tips

Question:  I am attempting to the add back the dropped members by executing the following ALTER DISKGROUP statement:

alter diskgroup
    data
add
    failgroup data_0001
disk
    '\\.\orcldiskdata1'
name
    data_0001
size 4096 m rebalance power 11  

 I get the following error message:

Failed to commit: ORA-15032: not all alterations performed ORA-15033: disk '\\.\ORCLDISKDATA1' belongs to diskgroup "DATA"  

What causes the ORA-15033 error?

Answer: The Oracle docs provide this on the ORA-15033 error:

ORA-15033: disk xxx belongs to diskgroup yyy

Cause: An attempt was made to ADD to a diskgroup a disk that was already part of another diskgroup, or an attempt was made to DROP / OFFLINE / ONLINE / CHECK a disk that was not part of the specified diskgroup.

Action: For ADD, check the path specifier for the disk. If it is certain that the disk is not in use by another diskgroup, the FORCE option may be used to override this check. For the other commands, check the name of the specified disk.  

In your case, the ORA-15033 error can be fixed by using the FORCE option:

alter diskgroup
   data
add
    failgroup data_0001
disk
    '\\.\orcldiskdata1' FORCE
name
    data_0001
size 4096 m rebalance power 11

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