- answer: This is due to the use of the Data Mover agent in the ESXi kernel. The Data Mover agent requires that all the blocks in the VMDK (Virtual Machine Disk) file be read and transferred to the ESXi host regardless of content. This results in the entire size of the VMDK to be transferred from the external array through the ESXi host to the destination datastore. The entire disk must be read in order to create a complete replica at the destination. The destination format and consumed space depends upon the destination datastore capabilities, protocol and format. Since all blocks must be read from the source datastore, the time to complete this operation may be longer than expected.
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