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for each SCSI host adapter.
ISA (Industry Standard
Architecture) A type of
computer bus used in most PCs. It
allows devices to send and receive
data 16 bits at a time.
KByte (kilobyte) A measure of
computer storage equal to 1024
bytes.
local bus A way to connect
peripherals directly to the
computer processor’s data path. It
bypasses the slower ISA and EISA
buses. PCI is a local bus standard.
logical unit A subdivision, either
logical or physical, of a SCSI
device. Most devices have only one
logical unit, but up to sixteen are
allowed for a 16-bit SCSI bus and
eight for an 8-bit SCSI bus.
LUN (logical unit number) An
encoded three-bit number for the
logical unit.
LVD (low-voltage differential)
A robust design methodology that
improves power consumption,
data integrity, cable lengths, and
support for multiple devices while
providing a migration path for
increased I/O performance.
MByte (megabyte) A measure of
computer storage equal to 1024
kilobytes.
mainboard A large circuit board
that holds RAM, ROM, the
microprocessor, custom integrated
circuits, and other components
that make a computer work. It
also has expansion slots for host
adapters and other plug-in boards.
main memory The part of a
computer’s memory that is
directly accessible by the CPU
(usually synonymous with RAM).
motherboard See mainboard. In
some countries, the term
motherboard is not appropriate.
multi-tasking The initiation and
control of more than one sequence
of operations. This allows
programs to operate in parallel.
multi-threading The
simultaneous accessing of data by
more than one SCSI device. This
increases the aggregate data
throughput.
NVRAM (Non-Volatile Random
Access Memory) An EEPROM
(Electronically Erasable Read
Only Memory chip) used to store
configuration information.
operating system A program
that organizes the internal
activities of the computer and its
peripheral devices. An operating
system performs basic tasks such
as moving data to and from
devices, and managing
information in memory. It also
provides the user interface.