Acer PCI to Ultra SCSI RAID Controllers DAC960PG - Manual (Page 72)

G-14 DAC960PG and DAC960PJ Installation Guide
Physical Device
Any device connected to some kind of hardware. For example, SCSI disk,
fibre disk, network disk, RAM disk, etc.
Physical Disk Drive
A single hard disk drive. Each physical disk drive is assigned a unique
identification address.
PROM
Programmable Read-Only Memory, memory that users with appropriate
instructions can reprogram.
Protocol
A special set of rules for transmitting data between two devices in a
telecommunication connection.
RAID
Redundant Array of Independent Disks, a collection of two or more disks
working together in an array. DAC960 controllers implement this
technology to connect up to 15 SCSI devices per channel. The different
forms of RAID implementation are known as “RAID levels.”
The system manager or integrator selects the appropriate RAID level for a
system. This decision will be based on which of the following are to be
emphasized:
Disk Capacity
Data Availability (redundancy or fault tolerance)
Disk Performance
RAID Adapters
See RAID Controller.
RAID Advisory Board (RAB)
An association of companies whose primary intention is to standardize
RAID storage systems. Mylex is a member of RAB.
RAID Controller
Low cost RAID controllers that use SCSI channels on the motherboard.