ABSTRACT
Central Site This chapter examines the practice of availability in its many guises in an objective fashion. The way vendors implement these practices is covered in Chapter 8.
In order to impose some structure on the blocks in the service configuration, it is convenient to split the configuration into domains of blocks with similar characteristics, for example, local server, local area network (LAN), wide area network (WAN), and remote server. In this section, we depart from the generic concept of blocks in a chain between service and service requestor. These domains can then be treated in the same mathematical way as the blocks were in the previous discussions. A schematic of a domain structure is illustrated in Figure 6.1.
