NDLI: Availability and performance oriented availability modeling of Webserver cache hierarchies

Content Provider	IEEE Xplore Digital Library
Author	Pawlicki, G. Sathaye, A.
Copyright Year	2004
Description	Author affiliation: San Jose State Univ., CA, USA (Pawlicki, G.; Sathaye, A.)
Abstract	Large scale Webserver configurations are widely implemented by Internet portals, and hence have evolved to rely upon numerous performance and high availability system mechanisms. The principle objective of this paper is to provide a method to compare key hierarchical features of Webserver configurations with respect to availability. Towards this goal, we model their structure and behavioral characteristics using stochastic reward nets. Several performance and availability measures are also introduced to compare two configurations: (1) a single cluster with multiple servers each featuring a percentage of its workload cached in main memory and (2) a two cluster site, a minimal star architecture providing benefits of geographic hierarchy. These are differentiated by the varying rates of cache service afforded by in-memory and on-disk caching, and the varying rates of cache service imposed by network latency in a distributed hierarchy. Both rely behaviorally upon the cache array routing protocol (CARP) to provide parent-child hierarchical caching, distributed parallel processing, hash based load balancing and dynamic repair and failover to peer systems. Principally, our results show that using a local cache hierarchy of both in-memory and disk caching significantly offsets the disadvantage of increased network latency occasioned by a geographically centralized site. Specifically, a geographic hierarchy alone is shown to be a much less efficient means of accommodating a heavy "read" workload.
Sponsorship	IEEE Reliability Soc. Electron. Div., American Soc. for Quality AIAA Reliability Div., American Soc. for Quality IEST QC & RE Div., IIE SAE International SOLE International Soc. of Logistics Soc. for Reliability Eng. System Safety Soc
Starting Page	586
Ending Page	592
File Size	496337
Page Count	7
File Format	PDF
ISBN	0780382153
DOI	10.1109/RAMS.2004.1285510
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-01-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Availability Delay Large-scale systems Internet Portals Stochastic processes Routing protocols Parallel processing Load management Peer to peer computing
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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