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Just make sure you run NFS with OpenFiler as its iSCSI implementation coming with a free version is broken (commerical one uses other iSCSI core engine

and it has no issues like that - nice way to make money Smiley Happy ). StarWind free version is fine with both (by default export iSCSI volume, can wrap a failover NFS share on top it if you prefer file rather then block access).

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Shared storage is one of the prerequisites for doing vMotion. You can use freeware like Openfiler or Starwind to configure shared storage.