ORA-15075: disk(s) are not visible cluster-wide

While adding a disk to a diskgroup in a RAC, you might face ORA-15075. Following is an example of this error.

SQL> alter diskgroup DATA add disk ‘ORCL:DATA4’, ‘ORCL:DATA5’; alter diskgroup DATA add disk ‘ORCL:DATA4’, ‘ORCL:DATA5’ * ERROR at line 1: ORA-15032: not all alterations performed ORA-15075: disk(s) are not visible cluster-wide

This message is very clear, disk that you have recently added to this server and then tried to add it to ASM diskgroup is not visible in one or more remaining RAC nodes. Check following

1. Make sure that the disk that you have added is accessible and visible in all RAC nodes.
2. If using oracleasmLib, execute “oraclasm listdisks” on all RAC nodes to confirm that all disks are listed there.
3. If you don’t see disks on other node(s), execute “oracleasm scandisks” command so that all disks are scanned and become visible to ASM instance on all RAC nodes.

Once done, retry adding disk(s) to the ASM diskgroup.