I have a storage domain that I have to empty, moving its disks to another storage domain,

Both source and target domains are iSCSI

What is the behavior in case of preallocated and thin provisioned disk? Are they preserved with their initial configuration?

Suppose I have one 500Gb thin provisioned disk

Why can I indirectly see that the actual size is 300Gb only in Snapshots tab --> Disks of its VM ?

Thanks,

Gianluca