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Glossary–44 edge switch 2/16 service manual
Glossary
S
S/390 mode
The mode that is most useful when attaching to IBM S/390 Enterprise Servers. See also open
systems mode; operating mode.
SA/MVS™
See System Automation for Operating System/390.
SAN
See storage area network; system area network.
SA OS/390™
See System Automation for Operating System/390.
scalable
Refers to how well a system can adapt to increased demands. For example, a scalable network
system could start with just a few nodes but easily expands to thousands of nodes. Scalability
is important because it allows the user to invest in a system with confidence that a business
will not outgrow it. Refers to anything whose size can be changed.
SCSI
See small computer system interface.
segment
A fabric segments when one or more switches cannot join the fabric because of various
reasons. The switch or switches remain as separate fabrics.
segmented E_Port
See segmented expansion port.
segmented expansion port
Segmented E_Port. E_Port that has ceased to function as an E_Port within a multiswitch fabric
due to an incompatibility between the fabrics that it joins. See also bridge port; fabric port;
generic port; node port.
serial port
A full-duplex channel that sends and receives data at the same time. It consists of three wires:
two that move data one bit at a time in opposite directions, and a third wire that is a common
signal ground wire.
server
A computer that provides shared resources, such as files and printers, to the network. Used
primarily to store data, providing access to shared resources. Usually contains a network
operating system.