The best replacement for vmfs is nfs.

The best alternatives to vmfs are rated as following:
★★★★★  nfs
★★★★  rdm
★★★  vmdk
★★  rdm performance
★★  nfs datastore
★  rdm exchange 2010
  datastore
  nfs datastores
  rdm vmware
  raw device mapping
  rdm vsphere

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Google Trends

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vmfs
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