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) = 1,0005 bytes (hard disk storage) or 1 PB (petabyte) = 1,024 TB or

 

1,0245 bytes (logical storage).

PCB

Printed circuit board.

R

 

RCU

Remote control unit.

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