There are some items to look at when VMotion failed:
1. Make sure no devices currently mounted.
2. If VMotion with snapshot, you will receive error warnings but you will be able to VMotion just fine but might having hard time revert it back or commit.
3. Different types of CPU model (which can be done by using Enhance VMotion Compatability) or hide the CPU NX flags.
4. You didn't enable VMotion option on the port group.
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Regards,
Stefan Nguyen
VMware vExpert 2009
iGeek Systems Inc.
VMware, Citrix, Microsoft Consultant