In this post, you’ll learn more about the Oracle ErrorORA-15026: disk ‘string’ is not an ASM disk with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
ORA-15026: disk ‘string’ is not an ASM disk
Reason for the Error ORA-15026: disk ‘string’ is not an ASM disk
The disk did not contain a valid ASM disk header.
How to fix the Error ORA-15026: disk ‘string’ is not an ASM disk ?
You can fix this error in Oracle by following the below steps
Check to see if the data on the disk has been changed by some system administrator action.