There is no noticeable I/O performance difference when using a larger block size. The block size should be chosen based on the size of the largest file and virtual disk that must be stored. Choose the VMFS block size carefully when creating VMFS datastores, because there is no way to change the block size of a VMFS datastore once it is created. The datastore must be reformatted with the required block size.
correct answer B. 512GB
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Ref: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003565
VMFS Size Limitations
There is no noticeable I/O performance difference when using a larger block size. The block size should be chosen based on the size of the largest file and virtual disk that must be stored. Choose the VMFS block size carefully when creating VMFS datastores, because there is no way to change the block size of a VMFS datastore once it is created. The datastore must be reformatted with the required block size.
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