CPI WARNING V-9-40-3861 NetBackup was installed on server1. The VRTSpbx rpms on server1 will not be uninstalled.
This is a known issue with the current installer. Both NetBackup and Storage Foundation install the VRTSpbx package, but the SFHA installer does not know to just skip it and continue if it is already present.
As a workaround, remove the VRTSpbx right before installing SF. The installer will put it back during the SF install.
For RHEL, you can use this syntax to remove it:
rpm -e --nodeps VRTSpbx
Note: It is not necessary to stop or restart any NBU daemons when doing this.