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Terminology
These are terms used in locating and describing components:
DefinitionTerm
Computer system housing that includes a structure of
external panels, front and rear doors, internal racking,
and dual PDUs.
Cabinet
Structure integrated into the cabinet into which
rackmountable components are assembled.
The rack uses this naming convention:
system-name-racknumber
Rack
The physical location of components installed in a
modular cabinet, measured in U values numbered 1 to
42, with U1 at the bottom of the cabinet. A U is 1.75 inches
(44 millimeters).
Rack Offset
A subset of a system that contains one or more modules.
A group does not necessarily correspond to a single
physical object, such as an enclosure.
Group
A subset of a group that is usually contained in an
enclosure. A module contains one or more slots (or bays).
A module can consist of components sharing a common
interconnect, such as a backplane, or it can be a logical
grouping of components performing a particular function.
Module
A subset of a module that is the logical or physical location
of a component within that module.
Slot (or Bay or Position)
A connector to which a cable can be attached and which
transmits and receives data.
Port
Number (one to four) of the fiber pair (LC connector)
within an MTP-LC fiber cable. An MTP-LC fiber cable
has a single MTP connector on one end and four LC
connectors, each containing a pair of fibers, at the other
end. The MTP connector connects to the ServerNet switch
in the c7000 enclosure and the LC connectors connect to
the CLIM
Fiber
A notation method used by hardware and software in
NonStop systems for organizing and identifying the
location of certain hardware components.
• Group-Module-Slot (GMS)
• Group-Module-Slot-Bay (GMSB)
• Group-Module-Slot-Port (GMSP)
• Group-Module-Slot-Port-Fiber (GMSPF)
A server blade that provides processing and ServerNet
connections.
NonStop Server Blade
On NonStop BladeSystems, locations of the modular components are identified by:
• Physical location:
— Rack number
— Rack offset
• Logical location: group, module, and slot (GMS) notation as defined by their position on
the ServerNet rather than the physical location
OSM uses GMS notation in many places, including the Tree view and Attributes window, and
it uses rack and offset information to create displays of the server and its components.
Component Location and Identification 25