In case you’re curious/adventurous/broke enough to try configuring your VMotion network on Fast Ethernet instead of Gigabit Ethernet, here’s what you can expect.
First, a warning from your VI client that you’re venturing into unsupported territory:
A friendly warning
And then, if you go ahead with the VMotion, a slight pause on the VM in question. The following is output from running while true; do date; sleep 1; done on a Linux guest during the VMotion:
Tue Feb 3 13:23:17 PST 2009 Tue Feb 3 13:23:18 PST 2009 Tue Feb 3 13:23:19 PST 2009 Tue Feb 3 13:23:20 PST 2009 Tue Feb 3 13:23:21 PST 2009 Tue Feb 3 13:23:22 PST 2009 Tue Feb 3 13:24:12 PST 2009 Tue Feb 3 13:24:13 PST 2009 Tue Feb 3 13:24:14 PST 2009 Tue Feb 3 13:24:15 PST 2009 Tue Feb 3 13:24:16 PST 2009
Note the fifty second pause between 13:23:22 and 13:24:12? Ouch…