Oracle RAC: " The process cannot access the file because another process has locked a portion of the file."

Adding a shared disk to the ASM disk group. Upon starting node2, it throws an error of "The process cannot access the file because another process has locked a portion of the file.". The reason for this is, VMX needs to enable disk sharing. This is only needed for adding a shared SCSI disk on VMware Workstation. Oracle Virtualbox has its own easier way to share disks.

Insert the following line to the VMX file. 

"disk.locking = "FALSE"

As a side note for adding a share disk on Oracle Virtualbox, all needed are the following steps.

--Open VirtualBox Manager Window

File | Virtual Media Manager

Select the new disk

Properties

Change Type from Normal to Shareable.

Click Apply.