VMs must be powered off to move the vmdk files.
Datastore relocation is only available during a cold migration.
If there is any possibility you can come up with one more LUN and can build a single ESX3 Server, you can use "DMotion" to migrate your VM and VMDK file from ESX2 to ESX3 while it is powered on.
OK, that I didn't know. Why on earth is the option offered if it just ignores it? Oh well, cold-state it is then.
I will have to come up with the additional LUN I think in that case to make it feasible. Thanks.
Wow, did THAT ever not work! Cold state migration with a test of relocating the vmdk files to different LUNs and I got this message:
Failed to relocate virtual machine; Invalid virtual machine configuration
This is a simple VM with two disk files; I am trying to relocate both vmdks...Perhaps I should follow some advice I got last night and just buy the storage guys a beer and get some temporary storage and forget about this cold state stuff.