Now that we have defined the characteristics of a computing grid, let us list the essential components of such a grid—specifically, Oracle's version of such as grid. In no particular order, the components of such a grid are as follows:
Computing resources such as servers, including their components such as CPUs, memory, and self-contained internal hard disks containing the operating system and swap.
Storage resources such as SANs, NAS, and even simple disk farms in some form of RAID (Redundant Array of Inexpensive Disks). It is important to note that these storage resources should be exposed to and be seen by all the servers.
Networks connecting servers. Usually, these are high speed, geographically clustered networks ...