Hitachi Data Systems
On-line system
An interactive computer system supporting users over a network of computer terminals.
Open system
A system whose characteristics comply with standards made available throughout the industry, and therefore can be connected to other systems that comply with the same standards.
Operating System
The operating system is the most important software program that runs on a computer. The operating system (OS) performs basic tasks such as recognizing input from a keyboard, sending output to the display screen, keeping track of files and directories on the disk and controlling peripheral devices such as disk drive and printers or a mouse. The OS acts as a traffic cop and schedules the various programs that the computer executes. The OS is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems can be classified as follows:
1)
2)
3)
4)
5)Real Time – Usually a stripped down OS that responds to input instantly.
Out of band
A communication that does not use the same bandwidth that carries data in a system. For example, the control information in the Lightning 9900™ Series systems do not use the same path as data and is therefore referred to as “out of band.”
Parity
A
PiT
A
POD
Performance On Demand.
Port/Port ID
See Fibre Channel.
66
