IBM System Storage TS2900, Руководство по установке, эксплуатации и обслуживанию

Страница: 243 / 257

Glossary
I-5
H
HD Slot Technology . H
igh-density (HD) slot
technology. Allows multiple cartridges to be stored
in a tiered architecture.
hertz (Hz) . Unit of frequency. One hertz equals one
cycle per second.
hex . Hexadecimal.
High Voltage Differential (HVD) . A logic signaling
system that enables data communication between a
supported host and the library. HVD signaling uses a
paired plus and minus signal level to reduce the effects
of noise on the SCSI bus. Any noise injected into the
signal is present in both a plus and minus state, and is
thereby canceled. Synonymous with
differential .
HVD . SCSI Bus High Voltage Differential
Hz . Hertz (cycles per second).
I
IBM Ultrium Tape Drive . Located within the library, a
data-storage device that controls the movement of the
magnetic tape in an IBM LTO Ultrium Tape Cartridge.
The drive houses the mechanism (drive head) that reads
and writes data to the tape.
ID . Identifier.
identifier (ID) . (1) In programming languages, a
lexical unit that names a language object; for example,
the names of variables, arrays, records, labels, or
procedures. An identifier usually consists of a letter
optionally followed by letters, digits, or other characters.
(2) One or more characters used to identify or name data
element and possibly to indicate certain properties of
that data element. (3) A sequence of bits or characters
that identifies a program, device, or system to another
program, device, or system.
IKE . Internet Key Exchange used in the IPsec protocol.
IML . Initial microprogram load.
incompatible magazine . This message may appear on
the Operator Panel during library initialization. It occurs
during factory restore or VPD. This is not a real issue
since it takes the library a while to configure.
initial microprogram load (IML) . The action of
loading a microprogram from an external storage to
writable control storage.
initiator . The component that executes a command.
The initiator can be the host system or the tape control
unit.
INST . Installation.
interface . A shared boundary. An interface might be a
hardware component to link two devices or it might be a
portion of storage or registers accessed by two or more
computer programs.
Internet Protocol Version 4 (IPv4) . See IPv4 .
Internet Protocol Version 6 (IPv6) . See IPv6 .
interposer . The part used to convert a 68-pin connector
to a 50-pin D-shell connector.
intervention required . Manual action is needed.
INTRO . Introduction.
I/O . Input/output.
I/O Station . Cartridge location dedicated for the
insertion of cartridges into and the removal of cartridges
from the library.
IOP . Input/output processor.
IP . Internet protocol
IP address . An identifier for a computer or device on a
TCP/IP network. Networks using the TCP/IP protocol
route messages based on the IP address of the
destination. See
IPv4 and IPv6 .
IPL . Initial program load.
IPsec (IP security) . A set of protocols for securing IPv6
network communications by authentication and
encryption.
IP Stack . A TCP/IP protocol stack that manages static
IP addresses.
IPv4 . A network layer protocol for packet-switched
networks. IPv4 supports 2
32
(about 4.3 billion)
addresses.
IPv6 . A network layer protocol for packet-switched
networks. It is the designated successor of IPv4 for
general use on the Internet. The main improvement
brought by IPv6 is the increase in the number of
addresses available for networked devices, allowing, for
example, each mobile phone and mobile electronic
device to have its own unique address.
ISV . Independent Software Vendor.
ITDT . IBM TotalStorage Diagnostic Tool.
ITST . Idle-time self-test.