Hi!
I am a system integrator SCADA Expert ClearScada.
The customer has 3 physical servers. On servers running VMWARE vSphere.
We will have two virtual machines that need to be organized ClearSCADA Hot-Standby Pair architecture. Each SCADA server attaches to the equipment physical servers (ClearSCADA via software key) - one works as a main, the other as the slave.
The answer specialists of SCADA Expert ClearScada:
Technically you don't want to change your MAC which is typically tied to a physical card but I believe vMotion handles this.
If I'm honest I haven't had a chance to try this, it is something I've been wanting to try for a while now just not had the hardware. If vMotion does manage the MAC addresses and the disk ids then you should be good, the one thing that could trip you up is if the MAC it assigns is from the local admin pool (based on the rules for MACs) then ClearSCADA will ignore it.
One option is a network based USB port and use a dongle, it still means a single point of failure though.
Note that if you read the documentation it will say the developers and testers have tested ClearSCADA on ESX servers, but I do not believe they have tested the architecture with any of the advanced features such as vMotion (or vSwitch) so you may want to perform some testing first offline to ensure that the licences are ok. The other area of concern would be in the ensuring the TCP state is maintained, else when you switch over you might see a resync with the Main or if it is the Main see a Main-Main which might not be appreciated.
What can you advise?