HP 316095-B21 - StorageWorks Edge Switch 2/24 User Manual page 157

Glossary
offline diagnostics
Diagnostics that only operate in stand alone mode. User operations cannot take place with
offline diagnostics running.
offline sequence
OLS. (1) Sequence sent by the transmitting port to indicate that it is attempting to initialize a
link and has detected a problem in doing so. (2) Sequence sent by the transmitting port to
indicate that it is offline.
offline state
When the Switch or Director is in the offline state, all the installed ports are offline. The ports
transmit an offline sequence (OLS) and they cannot accept a login got connection from an
attached device. Contrast with online state.
OLS
See offline sequence.
online
Referring to data stored on the system so it is available immediately to the user.
online diagnostics
Diagnostics that can be run by the customer engineer while the operational software is
running. These diagnostics do not impact user operations.
online state
When the Switch or Director is in the online state, all of the unblocked ports are allowed to log
in to the fabric and begin communicating. Devices can connect to the Switch or Director if the
port is not blocked and can communicate with another attached device if both devices are in
the same zone, or if the default zone is enabled. Contrast with offline state.
Open Systems Architecture
OSI. A model that represents a network as a hierarchical structure of functional layers. Each
layer provides a set of functions that can be accessed and used by the layer above. Layers are
independent, in that implementation of a layer can be changed without affecting other layers
(D).
open systems management server
OSMS. An optional feature that can be enabled on the Director or Switch through the Product
Manager application. When enabled, host control and management of the Director or Switch
are provided through an Open System Interconnection (OSI) device attached to a Director or
Switch port.
open systems mode
The mode that is used for HP or open fabrics. See also operating mode; S/390 mode(S/390
mode).
embedded web server user guide Glossary–27