ORA-59066
Multiple disk paths (%0!s) are discovering disk with identical disk header contents.
Cause
The Oracle Automatic Storage Management (Oracle ASM) disk discovery string had multiple paths configured for disks with an identical disk header. Oracle ASM could not distinguish whether these were separate disks with an identical disk header content or the same disk with different paths. The wrong Oracle ASM disk discovery string configuration may be responsible.
Action
Remove all except one of the valid paths to the disk from the disk discovery string and retry the disk operation.