These I consider the most important points about Exadata Patching:
Where is the most recent information?
MOS Note 888828.1 is your first read whenever you think about Exadata Patching
What is to patch with which utility?
Expect quarterly bundle patches for the storage servers and the compute nodes. The other components (Infiniband switches, Cisco Ethernet Switch, PDUs) are less frequently patched and not on the picture therefore.
The storage servers have their software image (more...)