Dell Adaptec U320 SCSI Raid 0 or 1 Controller Card - Manual (Page 51)

off-line array
An array that is not responding.
optimal
The state of an array when it is fully operational. For redundant arrays, the entire array is protected.
P
parity
In RAID, a form of redundancy used to recreate the data of a failed hard disk in a disk array. Used in RAID levels 2,
3, 4, and 5.
physical resources
The Adaptec Family Adapter products, channels, and SCSI devices installed in the server.
poll
A validation of discovery information.
R
RAID
Acronym for Redundant Array of Independent (Inexpensive) Disks. Coined in 1987 by researchers at the University of
California at Berkeley to describe a set of disk array architectures that provide fault tolerance and improved
performance.
RAID 0 (striping)
A single-level array consisting of two or more equal-sized segments residing on different disks. RAID 0 distributes
data evenly across its respective drives in equal-sized sections called stripes. RAID 0 arrays are not redundant.
RAID 1 (mirrored)
Single-level array consisting of two equal segments residing on two different drives. Provides redundancy by storing
identical copies on two drives.