In this entry we look at the ever-increasing internal capacity of direct attached storage (DAS) The capacity demands of a single server outpace its internal storage capabilities. This may no longer be justification enough to make the move to networked storage or to expand the network storage you have. The storage decision in a DAS world becomes very application specific. While SAN can, in most cases, out perform and out scale DAS, its in the area efficiency where it should have the biggest advantage and provide the biggest benefit.”]
Source: https://www.darkreading.com/database-security/das-vs-san—high-capacity