Glossary
Scalar i500 User’s Guide
384
CRU (Customer Replaceable Unit)
The smallest hardware component
that can be replaced at a customer installation by a customer.
D
Default
A value or setting that is selected by the hardware or software
unless specified otherwise by the user.
DHCP (Dynamic Host Configuration Protocol)
A protocol for assigning
dynamic IP addresses to devices on a network. DHCP supports a
mix of static and dynamic IP addresses.
Directory
A file that contains a list of other files.
Directory
is short for
directory file
.
Drivers
Software programs that enable a computer to communicate with
hard drives, CD ROM drives, printers, and other peripherals.
Drivers are stored on a hard disk and loaded into memory at boot
up.
E
Element ID - Logical
An address used by a library to locate and track
library component. The address is specified in programming
logic rather than on the physical location of a component within a
library. When a logical library is used, the logical element ID
masks the physical element ID.
Element ID - Physical
An address used by a library to locate and track
library component. The address is based on the physical location
of a component within a library. Applications expect to see
resources at specific IDs.
Ethernet
A type of local area network designed to transport data at rates
up to 10 million bits per second. Other software, such as TCP/IP
runs on top of Ethernet to provide high-level networking services
to applications.
Event
A condition that matches a numbered, predefined set of
circumstances.
Event log
A list of all predefined events logged by library and software
management tools.
Expansion Module
An optional module of the library. It provides
additional storage, tape drive capacity, power, and optional I/E
stations. The module lacks an operator panel touch screen and
LCB.
