8 Introduction to the New Mainframe: Large-Scale Commercial Computing
many smaller processors into fewer, larger systems. Using a mainframe system,
many companies have significantly lowered their total cost of ownership (TCO),
which includes not only the cost of the machine (its hardware and software) but
also the cost to run it.
IBM System z mainframes exhibit scalability characteristics in both hardware and
software, with the ability to run multiple copies of the operating system software
as a single entity called a
system complex or sysplex.
1.5.3 Integrity and security
One of the most valuable resources of a company is its data: client lists,
accounting data, employee information, and so on. This critical data needs to be
securely managed ...