One of our Vm's is a windows 2003 server. It has SAP on it.
We were able to log onto it, however when we did we were unable to use any of the services on there.
A hard reboot sorted that.
However, after looking at the vcenter events for this server I saw a few: 'virtual machine CPU usage changed from green to red'...and then later 'from red to green'.
Can such a message be due to a lack of vCPU's allocated to this machine? (it doesn't use a lot though).