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What Is the Recommended Allocation Unit Size When ODX Is Used on the Windows Host?
Offloaded data transfer (ODX) is a feature of Windows Server, which offloads data copy operations to storage arrays. If ODX is not used, a host reads data from and then writes it to a storage array to complete data copy. With ODX enabled, the data copying tasks are offloaded from the host to the storage array, reducing I/O workloads of the host.
If ODX is used, you are advised to set the allocation unit size to 64 KB when formatting disks on the Windows host. This allows ODX to use a minimum I/O size of 64 KB to maximize performance.