Some mount points that are not used by Oracle Grid Infrastructure can prevent unmounts and disable volumes in the kernel (reference Bug 8651848).

The following are examples of mount points that are not used by Oracle Grid Infrastructure:

• Network File System (NFS)

• Samba/Common Internet File System (CIFS)

If this reflects your situation, then stop using these features before initiating a shutdown, file system unmount, or disabling volumes.

Additionally, certain user space processes and system processes can use the file system or volume device in a way that prevents Oracle Grid Infrastructure from shutting down during a patch or upgrade. If this occurs, then use the lsof and fuser commands (Linux and UNIX) or the handle and wmic commands (Windows) to identify active processes on Oracle Automatic Storage Management Cluster File System (Oracle ACFS) file systems and Oracle ASM Dynamic Volume Manager (Oracle ADVM) volumes. To ensure that these processes are stopped, dismount all Oracle ACFS file systems or Oracle ADVM volumes and issue an Oracle Clusterware shutdown. Otherwise, errors can occur during Oracle Clusterware shutdown relating to activity on Oracle ACFS file systems or Oracle ADVM volumes that stop the successful shutdown of Oracle Clusterware.