Installation guide

Glossary-5
degraded The state of a FRU, group of FRUs, or part of a FRU, that has been isolated
because a fault was detected. The isolation is usually done to prevent
possibly faulty components from affecting other system components. The
part that is isolated is not always the faulty part alone; a normal part may be
degraded to isolate the faulty part. If a function required for the operation of
the system is degraded, a system failure may result.
delete A term used in Dynamic Reconfiguration to isolate or unassign a system
board from a domain.
device serial number The serial number assigned to each shipped component, stored in the FRUID
PROM.
disconnect A term used in Dynamic Reconfiguration to describe electrical disconnection
of a system board. Disconnecting a board disables the monitoring of that
board.
domain A set of one or more system boards that function as an independent system.
While the server is shared, an operating system can be installed in each
domain to enable each domain to operate as an independent system.
Each domain consists of a logical system board assigned to it. Each domain
is electrically insulated by each hardware partition. Therefore, if one domain
fails, it does not affect the other domains in the server.
Domain - SP
Communication Protocol
(DSCP)
The protocol that implements TCP/IP socket type communication (normally
performed between user levels) between the service processor and the
domain. This communication is performed for the mailbox type
communication performed by other software components.
Domain Component List
(DCL)
A list of system boards used to construct each domain
Domain ID (DID) Domain identifier.
downlink card A link card mounted in the I/O unit. Although this link card is physically
the same as the one mounted on the I/O board in the External I/O
Expansion Unit, the one mounted in the I/O unit is sometimes called a
downlink card. See also link card and uplink card.
DR See Dynamic Reconfiguration (DR).
DSCP See Domain - SP Communication Protocol (DSCP).
dual power feed A type of power feed for high-reliability systems that contain dual power
supply lines. If one line stops, the other line enables the system to continue
operation.
dummy panel/board A panel or board inserted into an unused slot or space. Attaching this panel
or board can prevent cooling air in the system from leaking.
DVDBP See DVD Backplane (DVDBP).