When you upgrade to ESX 4.1/ESXi 4.1, some components that might have been modified in the ESX 3.5/ESXi 3.5 or ESX 4.0/ESX 4.0 configuration are not preserved.

For ESXi, if you modified certain files in the ESXi 3.5 or ESXi 4.0 configuration, the modified configuration is not retained after the upgrade to ESXi 4.1. Modifications to the following files are not retained after the upgrade.

/etc/sfcb/sfcb.cfg

inetd.conf

motd

issue

inittab

chkconfig.db

For ESX, if you modified certain files in the ESX 3.5 or ESX 4.0 configuration, the modified configuration is not retained after the upgrade to ESX 4.1. Modifications to the following files are not retained after the upgrade.

/etc/sfcb/sfcb.cfg

/etc/vmware/firewall/services.xml

Resource Pool settings configured in ESX 3.5 might not be preserved after upgrade. This loss of configuration can happen in upgrade scenarios where there are no free resources.