NAS architecture allows you to connect multiple application servers to a central
storage server using replication and failover. Each application server can access
the same data.
Reliable, centralized storage with fast I/O. In most cases, a SAN provides a
redundant disk array that connected servers treat as local volumes, providing high
availability and better disk I/O performance than NAS. A SAN is a common
virtualized cluster that provides centralized access to I/O-intensive databases.
A high availability cluster consists of two or more services such as application
servers, file servers, and databases. Traffic is distributed by a load balancer, which
also provides failover in case of hardware or application failure.