By Chandra Kopparapu
From an insider--a shut examine high-performance, end-to-end switching solutions
Load balancers are quickly changing into an necessary resolution for dealing with the large site visitors calls for of the internet. Their skill to unravel a mess of community and server bottlenecks within the web age levels from dramatic advancements in server farm scalability to elimination the firewall as a community bottleneck. This booklet offers an in depth, updated, technical dialogue of this fast-growing, multibillion greenback marketplace, protecting the complete spectrum of topics--from server and firewall load balancing to obvious cache switching to international server load balancing. within the technique, the writer offers perception into the way in which new applied sciences are deployed in community infrastructure and the way they paintings. Written by means of an specialist who hails from a number one internet change seller, this ebook can assist community and server directors increase the scalability, availability, manageability, and safeguard in their servers, firewalls, caches, and sites.
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Additional info for Load Balancing Servers, Firewalls and Caches
Example text
The session record may also have a pointer to the real server table, or maintain an idle timer for that session. A session-table entry may be removed for several reasons, including session termination or reset, or idle-timer expiration. For example, if a client opens a session, and then the client computer died or hung, we need to detect that. The load balancer maintains an idle timer, which may be configurable by the user, and cleans the session entry when this timer expires. The load balancer must also send a TCP RESET to the server, as the server can release the resources associated with the session and reuse them for new sessions.
To perform this, the load balancer keeps a session table in its memory. An entry in the session table is created when a new session is initiated, and the entry will be removed when the session is terminated. Because a client or a server may die during the session, the load balancer runs the risk of filling up its session table with idle or inactive sessions. Therefore, the load balancer must also use a timer to terminate the idle sessions if there is no traffic for some time. 5, the session table is the foundation for stateful load balancing.
Com. The server returns the Web page content along with the list of URLs to objects such as images that are part of the Web page. The browser then retrieves each of the objects that are part of the Web page and assembles the complete page for display to the user. 1. The Server Farm with a Load Balancer Many server administrators would like to deploy multiple servers for availability or scalability purposes. If one server goes down, the other can be brought online while the failed server is being repaired.