Service Manual

PowerVault ML6000 Maintenance Guide 473
logical library
See partition
.
loop
With this Fibre Channel option, the port operates with attached loop-capable devices. If a point-to-point
device is attached, the appliance is not able to communicate with it.
loop ID
A unique 7-bit value from 0 to 126 that represents the 127 valid AL_PAs (physical addresses) on a loop.
LTO (Linear Tape Open)
A family of magnetic tape media that are “open” in the sense of not being owned by a single proprietor. LTO
comes in two formats, Accelis and Ultrium. Accelis is the fast access implementation, while Ultrium is the
high capacity implementation.
LUN (logical unit number)
A unique identifier used on a SCSI bus to distinguish between devices that share the same bus. A LUN can
be an end user, a file, or an application. In storage technology, a single large storage device might be
divided into smaller pieces, either to make the vast storage space more manageable or because the storage
space is dedicated to different servers, drives, or applications. When the storage space is divided into
smaller parts, each part is configured with its own SCSI unique identifier, or LUN.
magazine
A container for removable media storage used in tape libraries.
media
A material that stores data, such as tapes in cartridges or optical disks.
media ID
A barcode number attached to a specific piece of media.
media type
A format/size of media, for example, LTO.
medium
See media
.
mixed media
The ability of a library to simultaneously support multiple types of storage media.
N_Port (node port)
A port that has the capability to communicate only through an F-Port. It is a port on a computer, disk drive,
and so on, through which the device does its Fibre Channel communication as a direct fabric-attached port
for use with the point-to-point or fabric topology. It is identified by a world wide name.
NL_Port (node loop port)
A port that has the capability to communicate over both FC-AL hubs and through F_Ports.
online
A status for a component that indicates it is active and available for use.
OS (operating system)
A control program for a computer that allocates computer resources, schedules tasks, and provides the user
with a way to access the resources.
partition
An abstraction of an underlying physical library that may present a different personality, capacity, or both to
a host. It is a representation of real physical elements, combined to create a grouping that is different from
the physical library. Also a logical portion of the physical library that is viewed by the host as if it is a complete
library. Partitions present the appearance of multiple, separate libraries for purposes of file management,
access by multiple users, or dedication to one or more host application.
pathname
A list of directories separated by slashes (/) and ending with the name of a directory or nondirectory file. A
pathname is used to trace a path through the file structure to locate or identify a file.