NDLI: Feedback control of a Lotus Notes server: modeling and control design

Content Provider	IEEE Xplore Digital Library
Author	Gandhi, N. Tilbury, D.M. Parekh, S. Hellerstein, J.
Copyright Year	2001
Description	Author affiliation: Dept. of Mech. Eng., Michigan Univ., Ann Arbor, MI, USA (Gandhi, N.)
Abstract	This paper considers the modeling and feedback control of a mail server running Lotus Notes/sup TM/. Computing systems such as this typically have two competing control goals: maximize throughput and minimize response time. To achieve these goals, a control input (tuning control) is used to limit the number of users allowed to connect to the mail server at any one time. The measured output is the server queue length-the number of requests that are waiting to be processed. Because response time is a client metric and thus difficult to measure at the server, we formulate the control problem as tracking a reference server queue length. A linear input-output model of the system is identified experimentally and used to design an integral controller. Losses in the queue length measurement due to the fact that requests are only logged after they are served are accounted for by another linear model. Experimental results are presented showing the effectiveness of a low-gain controller and the saturation problems experienced by a high-gain controller. The paper concludes with a discussion of future work.
Sponsorship	American Autom. Control Council
Starting Page	3000
Ending Page	3005
File Size	595436
Page Count	6
File Format	PDF
ISBN	0780364953
ISSN	07431619
DOI	10.1109/ACC.2001.946372
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-06-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	American Automatic Control Council(AACC)
Subject Keyword	Feedback control Control design Control systems Length measurement Delay Electronic mail Throughput Resource management Mechanical engineering Control system synthesis
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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