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The Offloaded Data Transfer (ODX) feature of Windows Server 2012 and Windows 8 or ODX is a Microsoft technology that, like Full Copy, allows the offloading of host activity to the array. ODX can be a feature that is used in VMware environments when:
In such an environment, ODX is used for certain host activity, such as copying files within or between the physical RDMs. ODX is not used on virtual disks that are part of the VM. ODX also requires the use of Fixed path. PP/VE or NMP does not work. If using either multipathing software, Microsoft recommends that ODX be disabled on Windows.
Note: See Microsoft TechNote Deploy Windows Offloaded Data Transfers.
In order to take full advantage of ODX, the allocation unit on the drives that physical RDMs back should be 64k.
Note: There is no user interface to indicate ODX is being used.