The 2 log files are in VAR/LOG/VMWARE dir
vpx-iupgrade.log and vpx-rupgrade.log
What are these files and can I delete them?
vpx-iupgrade.log is the log created when you upgrade virtual center and it installs a new vpx agent on the esx server. rupgrade.log is probably a similar type of log. I don't see why you could not delete them.
These files are log files from the VC agent when an ESX Server is added to VirtualCenter, several RPMsare pushed to the host and installed. The results are logged to /var/log/vmware/vpx-iupgrade.log. When removing an ESX Server host from VirtualCenter, the reverseprocess is logged as wellvpx-rupgrade.log
You can safely delete these files if you want.