Highly Available and Scalable Cluster-based Web Servers

Server responsiveness and availability are more important than ever in today’s client/server dominated network environments. Recently, researchers have begun to consider cluster-based computers using commodity hardware as an alternative to expensive specialized hardware for building scalable Web servers. In this paper, we present performance results comparing two cluster-based Web servers based on different server infrastructures: MAC-based dispatching (LSMAC) and IP-based dispatching ( LSNAT). Both cluster-based server systems were implemented as application-space programs running on commodity hardware. We point out the advantages and disadvantages of both systems. We also identify when servers should be clustered and when clustering will not improve performance.

[1]  Clement R. Attanasio.  A Virtual Multiprocessor Implemented By an Encapsulated Cluster of Loosely Coupled Computers , 1992 .

[2]  Daniel M. Dias,et al.  A scalable and highly available web server , 1996, COMPCON '96. Technologies for the Information Superhighway Digest of Papers.

[3]  Roy T. Fielding,et al.  Hypertext Transfer Protocol - HTTP/1.0 , 1996, RFC.

[4]  Yi-Min Wang,et al.  ONE-IP: Techniques for Hosting a Service on a Cluster of Machines , 1997, Comput. Networks.

[5]  Der-hwa Gan,et al.  Load Sharing using IP Network Address Translation (LSNAT) , 1998, RFC.

[6]  Erich M. Nahum,et al.  Locality-aware request distribution in cluster-based network servers , 1998, ASPLOS VIII.

[7]  Guerney D. H. Hunt,et al.  Network Dispatcher: A Connection Router for Scalable Internet Services , 1998, Comput. Networks.

[8]  Eric Levy-Abegnoli,et al.  Design and performance of a Web server accelerator , 1999, IEEE INFOCOM '99. Conference on Computer Communications. Proceedings. Eighteenth Annual Joint Conference of the IEEE Computer and Communications Societies. The Future is Now (Cat. No.99CH36320).