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mirroring
The 100% duplication of data on one disk drive to another disk drive. Each disk is
the mirror image of the other.
multi-threaded
Having multiple concurrent or pseudo-concurrent execution sequences. Used to
describe processes in computer systems. Multi-threaded processes allow
throughput-intensive applications to efficiently use a disk array to increase I/O
performance.
parity
Also known as “Rotated XOR Redundancy”, which refers to a method of providing
complete data redundancy while requiring only a fraction of the storage capacity
normally associated with redundancy.
Peripheral Component Interconnect (PCI) bus
A standard bus interface that allows connection between PCI-based peripheral
devices and expansion cards. The PCI bus offers a large number of bus interface
features, the most desirable being high-speed data transfer rates that are close to or
exceed local bus or CPU bus speeds.
physical pack
A group of individual disk drives (preferably identical) that are logically tied to
each other and are addressed as a single unit. A physical pack can have one or
more system drives in it.
primary RAID controller
The RAID controller board in the system base unit that connects to the boot disk
drives of the primary disk array.
RAID 0
An array configuration where data is striped across multiple drives offering faster
read/write performance than a single drive. No redundancy is provided.
RAID 0+1
See RAID 10.
RAID 1
An array configuration where data is mirrored across pairs of drives. All data is
100% duplicated.
RAID 10
An array configuration where data is striped across drives as in RAID 0. Each
stripe is then mirrored as RAID 1. This combination of RAID 0 and RAID 1 is also
referred to as "RAID 0+1" or "RAID 1+0".
