Abstract
The switft growth of the Internet has boosted the use of
Web based services and in some pratical cases has led to
overwhelming request bursts to servers. Relational
database queries, image storage/retrieval and other new
types of application transactions have become
increasingly popular. Their coexistence in commercial
parallel and distributed systems have generated soma
uniquely new loading problems. For example, the constant
increase of request rate finally leads to processing
power requirement exceeding that of the accessed server.
As a consequence, the response times increase and some
portion of the requests are lost. Clustering of servers
to meet the growing demand for server processing
capacity, especially in web-based service supply, have
created the need for intelligent switching at front-end
devices. As a consequence of clustering, multilayer
switching schemes have been developed to enable optimum
loading of the individual servers in a cluster. In this
paper, we formulate the load balancing problem taking the
QoS into consideration and introduce a QoS aware load
balancing algorithm (QoS-LB). The performance of the
algorithm is simulated and results indicating the load
balancing capacity of the algorithm are presented. The
overall idea is to describe an algorithm that actually
provides Class of Service based differentiated access to
server clusters and offers better playgroung for QoS
mechanisms in client-servers environments. The
engineering task to offer guarantees with such a
differentiation tool is out of the scope of this paper.
Original language | English |
---|---|
Pages (from-to) | 144-149 |
Journal | WSEAS Transactions on Communications |
Volume | 1 |
Issue number | 1 |
Publication status | Published - 2002 |
MoE publication type | A1 Journal article-refereed |
Keywords
- server laod balancing
- content-based switching
- QoS