How to fix the Oracle error ORA-15307: disk string not discoverable by CSS; diskgroup string has CSS voting files?

In this post, you’ll learn more about the Oracle ErrorORA-15307: disk string not discoverable by CSS; diskgroup string has CSS voting files with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-15307: disk string not discoverable by CSS; diskgroup string has CSS voting files

Reason for the Error ORA-15307: disk string not discoverable by CSS; diskgroup string has CSS voting files

An attempt was made to add a disk which cannot be discovered by Cluster Synchronization Services (CSS). CSS has voting files in the disk group and will not be able to use the new disk if CSS cannot discover the disks.

How to fix the Error ORA-15307: disk string not discoverable by CSS; diskgroup string has CSS voting files ?

You can fix this error in Oracle by following the below steps

Update the Automatic Storage Management (ASM) disk string in the Grid Plug and Play (GPnP) profile to include the specified disk and retry the operation. Alternatively, migrate the CSS voting files out of the diskgroup and retry the operation