The PowerStore file system uses virtualized file servers that are known as NAS servers. A NAS server contains the configuration, interfaces, and environmental information that is used to facilitate access to the file systems. This information includes services such as DNS, LDAP, NIS, NDMP, anti-virus, and more.
New NAS servers are automatically assigned on a round-robin basis across the available PowerStore nodes. The preferred node acts as a marker to indicate the node that the NAS server runs based on this algorithm. After it is provisioned, the preferred node for a NAS server never changes. The current node indicates the node on which the NAS server is running. Changing the current node moves the NAS server to a different node, which can be used for load-balancing purposes. When a NAS server is moved to a new node, all file systems on the NAS server are moved along with it.