If you are just moving the LUN between storage groups, that’s essentially changing the host/LUN masking. The data is untouched and remains. ESX has mechanisms to detect snapshots, etc that may require additional actions to mount the volume, but the data will be there.  Richard J Anderson
What happens to the lun data when we remove the lun from a ESX storage group(ESX1) and put it into another ESX storage group(ESX2).? Will the original data be available intact to the new storage group(ESX2) or do we need to do something specific before we remove and add the lun.? Any thoughts?
Resuse of lun from one storage group to another.