With default settings cross-platform agents in Operations Manager 2007 R2 don’t fail-over to another management server if the primary management server goes offline. If the primary management server goes offline you will loose monitoring of all cross-platform machines communicating through that management server. The System Center Cross platform and Interop team blog has a couple of scripts that can help you manage cross-platform machines. One of these scripts is used to to change the current management server monitoring a UNIX/Linux server (or group of UNIX/Linux servers) to a new management server.
But if you move a cross-platform over to another management server you will get an alert like this
AÂ simple explanation to this is that the new management server don’tÂ trust the CA which have issue the certificate that the cross-platform machine is communicating with. You can solve this by copy the certificate from the management server that first discover the cross-platform machine over to the second management server. Store the certificate under Local Computer/Trusted Root Certification Authorities (in the certificates MMC). The certificate is named SCX-Certificate, issued by the primary management server.
When the new management server has the certificate installed it will start communicate with the cross platform machine. You could build a timed script two state monitor to check if the first management server is working, else run the script to move all cross-platform agents.