IBM TS4500, Введение и руководство по планированию

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one of four screw-operated jacks for
raising or lowering the library.
library frame
The basic unit of the TS4500 tape library.
The frame includes the hardware support
structure, covers, mechanisms, and parts.
Two types of frames are available: base
frames (Models Lxx) and expansion
frames (Models Dxx and Sxx).
Library Manager
See IBM 3953 Library Manager Model L05 .
library power switch
On the front of the TS4500 tape library, a
button that switches the power to the
library on and off.
license key
A key or password that is required to
enable advanced function.
lightweight directory access protocol (LDAP)
A set of protocols that are used to access
information directories. LDAP, an open
protocol, is based on the standards that
are contained within the X.500 standard,
but is simpler. And unlike X.500, LDAP
supports TCP/IP, which is necessary for
any type of Internet access.
Linear Tape-Open (LTO)
A type of tape storage technology that
was developed by the IBM Corporation,
Hewlett-Packard, and Certance. LTO
technology is an “open format”
technology, which means that its users
have multiple sources of product and
media. The “open” nature of LTO
technology enables compatibility between
different vendors' offerings by ensuring
that vendors comply with verification
standards. The LTO technology is
implemented in two formats: the Accelis
format focuses on fast access; the LTO
format focuses on high capacity. The LTO
format is the preferred format when
capacity (rather than fast access) is the
key storage consideration.
line frequency
The frequency (in hertz) of the ac line
voltage that the TS4500 tape library
requires for normal operation.
link In Fibre Channel technology, the physical
(optical) connection between two nodes of
a network, which includes the
combination of the link connection (the
transmission medium) and two link
stations, one at each end of the link
connection.
liquid crystal display (LCD)
A low-power display technology that is
used in computers and other I/O devices.
load Pertaining to the TS4500 tape library and
following the insertion of a tape cartridge
into a cartridge storage slot, the act
(performed by the cartridge accessor) of
transferring the cartridge from the storage
slot to the drive and of positioning the
tape (performed by the tape drive) for
reading or writing by the drive head.
load and unload cycle
The act of inserting a cartridge into a tape
drive, loading the tape to load point,
rewinding the tape into the cartridge, and
ejecting the cartridge from the drive.
load point
The beginning of the recording area on
magnetic tape.
load-to-ready time
After a cartridge is inserted into a drive,
the amount of time between when the
drive threads the tape and when the drive
becomes ready to accept server
commands.
local area network (LAN)
(1) A computer network that is on a user's
premises within a limited geographical
area. Communication within a local area
network is not subject to external
regulations; however, communication
across the LAN boundary might be
subject to some form of regulation.
(2) A network in which a set of devices is
connected to other sets of devices for
communication and that can be connected
to a larger network.
local authentication
The process of validating a user identity
to the system according to the local
operating system account to which the
user logged in. If the user is
authenticated, the user is mapped to a
principal.
logical library
With the TS4500 tape library, a set of tape
drives and tape cartridges that are
defined as a library by an operator. The
Glossary
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