The generic term usually used in conjunction with the amount, of long or short term storage in a computer. Examples being 60GB hard drive or 512MB of RAM (short term).

Servers that provide the same services and data to users, providing a higher level of redundancy. So if one server is unavailable to the users the other takes over and provides the services/data.

Multipathing is the use of redundant storage network components responsible for transfer of data between the server and storage. These components include cabling, adapters and switches and the software that enables this.