At this point in time, most customers expect to have these features in both block- and file-based storage products....
In block-based products, these features have historically been between "like" systems only (systems from the same vendor), but that's been changing over the last few years to become more heterogeneous, though heterogeneity is still the exception. The features are available, but there may be operational issues that add to the complexity of a unified [or multiprotocol] storage platform.
Listen to the unified storage FAQ audiocast.
Go to the beginning of the Unified Storage FAQ Guide.