ESX Server 3 Copy vs. Cloning
Copy vs. Clone
In VMWare Server one can stop the server and run cp /VMWare/VMImage /AnotherDir/VMImage -r and the image is find and it is fast. Howerver, if you do this on the vmfs files system you will waste lots of time. The best command thus far that I have used is vmkfstools -i /vmfs/volume/storage1/VMImage.vmdk /vmfs/volume/storage2/VMImage01.vmdk (make sure you have a filename.vmdk or it will not clone.
This will cause the VMFS files system to clone the disk at the SCSI or SAS speeds.
From VMWare
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