Installing Oracle Linux 7 for OEM13c or Oracle VM Manager
Oracle Linux is free to use, download and update, you can download Oracle Linux at http://edelivery.oracle.com/.
The file system’s size of /u01 depends on the OVM or OEM sizing. The Oracle VM Manager Requirements are available at https://www.oracle.com/virtualization/vm-server-for-x86/specifications.html. The OEM13c’s sizing guide is available at https://docs.oracle.com/cd/E63000_01/EMBSC/preinstall_req_hw.htm#EMBSC121