Hewlett-packard Company

Other

Hewlett-packard Development Company, L.p.

Tai Y Jin

Richard J Friedrich

Martin F Arlitt

Srinivas Ramanathan

Nina T Bhatti

Ludmila Cherkasova

John A Dilley

Anna Maria Zara

Edward H Perry

James D Salehi

Stephane J Perret

Manjari Asawa

A data access network system is described that includes a content server coupled to a plurality of proxy servers via an interconnect network. The content server store at least one content file. The data access network system also includes a system of maintaining content consistency between the content server and the proxy servers. The system includes a subscription manager in the content server that specifies all of the proxy servers that are subscribed to the content file. The system also includes a consistency manager that notifies all of the subscribed proxy servers that cache the content file to discard the cached content file from those proxy servers when the content file is updated in the content server. A method of maintaining content consistency between the content server and the proxy servers is also described.

Content consistency in a data access network system

A method and system for caching objects and replacing cached objects in an object-transfer environment maintain a dynamic indicator (Pr(f)) for each cached object, with the dynamic indicator being responsive to the frequency of requests for the object and being indicative of the time of storing the cached object relative to storing other cached objects. In a preferred embodiment, the size of the object is also a factor in determining the dynamic indicator of the object. In the most preferred embodiment, the cost of obtaining the object is also a factor. A count of the frequency of requests and the use of the relative time of storage counterbalance each other with respect to maintaining a cached object in local cache. That is, a high frequency of requests favors maintaining the object in cache, but a long period of cache favors evicting the object. Thus, cache pollution is less likely to occur.

Caching protocol method and system based on request frequency and relative storage duration

A data service system is accessible through a plurality of access requests. The data service system includes a user access request classification system for classifying the access requests. The user access request classification system includes a request classifier that classifies each of the access requests into one of a plurality of classes based on a predetermined classification policy. The user access request classification system also includes a plurality of buffers coupled to the request classifier. Each buffer corresponds to one of the classes to receive the access requests classified by the request classifier as belonging to that class such that the data service system processes the access requests in accordance with their classes. A method of classifying user access requests for the data service system is also described.

Method and systems for allowing data service system to provide class-based services to its users

A cache system is described that includes a storage that is partitioned into a plurality of storage areas, each for storing one kind of objects received from remote sites and to be directed to target devices. The cache system further includes a cache manager coupled to the storage to cause objects to be stored in the corresponding storage areas of the storage. The cache manager causes cached objects in each of the storage areas to be replaced in accordance with one of a plurality of replacement policies, each being optimized for one kind of objects.

Web cache performance by applying different replacement policies to the web cache

A data service system is described that includes a plurality of data content sites and is coupled to a number of user terminals via a network. The data service system also includes a system for providing performance guarantees for the content sites. The system for providing performance guarantees includes a plurality of class processors, each for controlling access throughput of one of the content sites in accordance with a predetermined admission control policy. When one of the class processors receives an access request for one of the content sites, that class processor determines if the access request should be accepted based on the corresponding admission control policy and sends the access request to the corresponding content site when accepting the access request. The system also includes a classifier that determines to which one of the class processors the access request should be sent. A method of controlling access throughput of the content sites is also described.

Method and system for providing performance guarantees for a data service system of a data access network system

A scheme is described for a data service system having a number of modules. Some of the modules are interdependent. To measure the status of an individual module, the scheme first collects measurements from a number of measurement routes that involve the module. Then the scheme analyzes the interdependencies of the measurements to determine the status of the individual module. The scheme may also determine status of the data service system with a minimal number of measurement routes. This is done by determining (1) all possible measurement routes, (2) determining the dependency between the modules and the measurement routes, and (3) analyzing the dependency to select minimal number of the measurement routes. The scheme can diagnose whether a module is a problematic module or not by analyzing a number of measurements that involve the module. If one of the measurements is good, the module is identified as non-problematic. The data service system may also include a test target coupled to a networking module of the data service system to allow service test signals to be measured through the network module.

Method and system for managing data service systems

A method and system of monitoring throughput of a data access system includes logging each transfer of data from a content server to a remote site, with each log entry including information indicative of transfer size, date, times, source and destination. The method includes accessing the log information in a passive and non-intrusive manner to evaluate the performance of transfers to a selected subset of the remote sites. In another embodiment, the performance evaluation is implemented for system resource allocation planning. In the preferred embodiment, the data access system is a broadband data system and the content servers utilize Internet applications. Also in the preferred embodiment, the data throughput is measured by the transfer rate of useful data, rather than all data including retransmissions.

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San Mateo, CA, United States of America

Tai Y Jin