Abstract - The intent of this paper is to give users of database software, a basic
understanding of the enhanced security capabilities achieved through Hard Disk
Shadowing over IP networks. The paper discusses the design and implementation of Hard
Disk Shadowing system over a packet switched Internet Protocol(IP) network. The system
creates an accurate copy of critical information at two drives simultaneously thus
providing identical failover storage devices on two servers.This leverages the existing IP
network infrastructure, hence minimizing deployment time and total cost of development.
Index Terms-Hard Disk Shadowing, Reproduction Sets, Slist, Statfile
Timely access to accurate and up-to-date information is critical to the success of businesses and
institutions today. Applications such as business intelligence and e-commerce demand it, and
people attached with them expect it.With the volume of information nearly doubling annually for
the larger organizations data storage, access and security are among the most demanding
challenges facing database management.
Database systems are today marked by a number of factors that can disrupt their normal
operations.The first factor is information growth.The systems are handling huge volumes of data,
and the volume is growing exponentially.As a result the system managers are swimming in disks
and tapes second factor is the increasing demand for access to applications. The services are now
required literally around the clock. A third factor is that systems are changing all the time, with
new applications, major enhancements to .existing applications, and new technology. Finally the
database systems face continuo us intentional or unintentional security threats.
Each of these factors directly involve or impact movements of huge amounts of data, in
increments or all at once for one reason or another, from one location to another.Hard Disk
Shadowing can provide an elegant solution for data protection, data replication...