1. A method comprising: specifying, in a network storage system, a LUN data type for a LUN; receiving, at the network storage system, write data associated with a request directed to the LUN, the write data having a LUN data type attribute; determining, by the network storage system, whether the LUN data type attribute of the write data corresponds to the LUN data type of the LUN; and if the LUN data type attribute of the write data is determined to correspond to the LUN data type of the LUN, then allocating, by the network storage system, at least some data blocks in the LUN for the write data, and otherwise, denying the request access to the LUN.