Glossary
A
AMS Adaptable module storage.
ATA Advanced Technology Attachment standard.
C
CHA Channel adapter. A device that provides the interface between the array and the external host
system. Occasionally, this term is used synonymously with the term channel host interface processor
(CHIP).
CV Custom-sized volume.
E
ESCON Enterprise systems connection An optical interface used to connect the mainframe to the control
unit; a predecessor to FICON.
ExG External volume group.
F
FC Fibre Channel. A network technology primarily used for storage networks.
FICON Fibre connectivity. Hardware that connects the mainframe to the control unit.
H
HDD Hard disk drive.
L
LD, LDEV Logical device. An LDEV is created when a RAID group is carved into pieces according to the
selected host emulation mode (that is, OPEN-3, OPEN-8, OPEN-9). The number of resulting LDEVs
depends on the selected emulation mode. The term LDEV is also known as term volume.
LDKC Logical disk controller.
LUN Logical unit number.
M
MCU Main control unit.
MIH Missing interrupt handler.
O
OTP Online transaction processing.
P
P-VOL Primary volume.
PB Petabyte. 1 PB (petabyte) = 1,000
5
bytes (hard disk storage) or 1 PB (petabyte) = 1,024 TB or
1,024
5
bytes (logical storage).
PCB Printed circuit board.
R
RCU Remote control unit.
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