2
Fig. 1.1. Total Sites Across All Domain Surveyed by Netcraft
The Locality Aware Request Distribution (LARD) mechanism proposed in [58] considers
both locality and load balancing issues in a distributed server. The webswitch in LARD
forwards all requests for the same Web object to a server node that has the requested
file in its cache. If the load on that node is high, then the request is forwarded to
another lightly loaded node that accesses the content from the disk. However, this
software implemented Layer 7 webswitch may not scale well since it needs to parse all
requests to determine the forwarding node, thus creating a performance bottleneck.
The event driven distributed web server, implemented at Rutgers University (PRESS),
is probably the first effort that utilizes user level communication on distributed Web
servers with a Layer 4 webswitch [23]. The clients in the PRESS model communicate
with the cluster using TCP over a Fast Ethernet, while the intra cluster communication
uses VIA over cLAN. Due to the low cost of the intra cluster communication, reading
a file from a remote cache turns out to be faster than reading the file from the local












  

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