The factual accuracy of parts of this article (those related to article) may be compromised due to out-of-date information. Please help update this article to reflect recent events or newly available information.(December 2012)
Network Load Balancing Services (NLBS) is a Microsoft implementation of clustering and load balancing that is intended to provide high availability and high reliability, as well as high scalability. NLBS is intended for applications with relatively small data sets that rarely change (one example would be web pages), and do not have long-running in-memory states. These types of applications are called stateless applications, and typically include Web, File Transfer Protocol (FTP), and virtual private networking (VPN) servers. Every client request to a stateless application is a separate transaction, so it is possible to distribute the requests among multiple servers to balance the load. One attractive feature of NLBS is that all servers in a cluster monitor each other with a heartbeat signal, so there is no single point of failure.
In its current incarnation in Windows Server 2003, NLBS does not support automatic removal of a failed server from a cluster unless the server is completely offline, or if its NLBS service is stopped. For example, if a web server is returning an error page instead of correct content, it is still perceived as "alive" by NLBS. As such, a monitoring script is typically required on every participating node, which checks the correctness of local web page delivery, and calls the nlb.exe utility to add or remove itself from the cluster as needed.
Historyedit
Windows NT Load Balancing Service (WLBS) is a feature of Windows NT that provides load balancing and clustering for applications. WLBS dynamically distributes IP traffic across multiple cluster nodes, and provides automatic failover in the event of node failure. WLBS was replaced by Network Load Balancing Services in Windows 2000.
network, load, balancing, services, factual, accuracy, parts, this, article, those, related, article, compromised, date, information, please, help, update, this, article, reflect, recent, events, newly, available, information, december, 2012, nlbs, microsoft, . The factual accuracy of parts of this article those related to article may be compromised due to out of date information Please help update this article to reflect recent events or newly available information December 2012 Network Load Balancing Services NLBS is a Microsoft implementation of clustering and load balancing that is intended to provide high availability and high reliability as well as high scalability NLBS is intended for applications with relatively small data sets that rarely change one example would be web pages and do not have long running in memory states These types of applications are called stateless applications and typically include Web File Transfer Protocol FTP and virtual private networking VPN servers Every client request to a stateless application is a separate transaction so it is possible to distribute the requests among multiple servers to balance the load One attractive feature of NLBS is that all servers in a cluster monitor each other with a heartbeat signal so there is no single point of failure In its current incarnation in Windows Server 2003 NLBS does not support automatic removal of a failed server from a cluster unless the server is completely offline or if its NLBS service is stopped For example if a web server is returning an error page instead of correct content it is still perceived as alive by NLBS As such a monitoring script is typically required on every participating node which checks the correctness of local web page delivery and calls the nlb exe utility to add or remove itself from the cluster as needed History editWindows NT Load Balancing Service WLBS is a feature of Windows NT that provides load balancing and clustering for applications WLBS dynamically distributes IP traffic across multiple cluster nodes and provides automatic failover in the event of node failure WLBS was replaced by Network Load Balancing Services in Windows 2000 Auto fail over is also a part in this frame nbsp This computer networking article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Network Load Balancing Services amp oldid 1094042811, wikipedia, wiki, book, books, library,
