HP ProLiant DL380G5-WSS 3.7.0 HP StorageWorks HP Scalable NAS File Serving Sof - Page 301
Con virtual hosts, Overview, Cluster health and virtual host failover
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17 Configure virtual hosts HP Scalable NAS uses virtual hosts to provide failover protection for servers and network applications. Overview A virtual host is a hostname/IP address configured on a set of network interfaces. Each interface must be located on a different server. The first network interface configured is the primary interface for the virtual host. The server providing this interface is the primary server. The remaining network interfaces are backups; the servers providing these interfaces are the backup servers. By default, HP Scalable NAS directs network traffic for the virtual host to the primary interface. The primary and backup servers do not need to be dedicated to these activities; all servers can support other independent functions. The network interface currently receiving the network traffic is the active interface and is labeled as "Active" on the Management Console. This interface is typically the primary interface; however, if HP Scalable NAS has redirected the network traffic to a backup interface, that interface becomes the active interface. Network interfaces not currently receiving network traffic for a virtual host are called inactive interfaces. After creating virtual hosts, you will need to configure your network applications to recognize them. When clients want to access a network application, they use the virtual host address instead of the address of the server where the application is running. Cluster health and virtual host failover To ensure the availability of a virtual host, HP Scalable NAS monitors the health of the administrative network, the active network interface, and the underlying server. If you have created service or device monitors, those monitors periodically check the health of the specified services or devices. If any of these checks fail, HP Scalable NAS can transfer the virtual host to a backup interface on another server and the network traffic will continue. HP Scalable NAS File Serving Software administration guide 301