HP StorageWorks 2/16V Brocade Glossary (53-1000040-03, November 2006) - Page 26

Glossary NOS Not operational. The NOS primitive sequence is transmitted to indicate that the FC_Port transmitting the NOS has detected a link failure or is offline, waiting for the offline sequence (OLS) to be received. NPIV N_Port ID virtualization. Allows a single Fibre Channel port to appear as multiple, distinct ports providing separate port identification and security zoning within the fabric for each operating system image as if each operating system image had its own unique physical port. NR_Port A normal E_Port used to connect an FC Router to a backbone fabric. NS Name Server. The service provided by a fabric switch that stores names, addresses, and attributes related to Fibre Channel objects. Can cache information for up to 15 minutes. Also known as "Simple Name Server" or as a "directory service." See also Simple Name Server (SNS). NSCAM Name Server Cache Manager. Updates the Name Server (NS) databases across switches as a background task. Nx_Port A node port that can operate as either an N_Port or NL_Port. OFC Open fiber control. A method used to enable and disable laser signaling for higher-intensity laser transceivers. OLS Primitive sequence offline. OLTP Online transaction processing. ON Offline notification. Refers to an ELS field that appears in portLogDump command output. OPN Open primitive signal. Applies only to arbitrated loop; sent by an L_Port that has won the arbitration process to open communication with one or more ports on the loop. ordered set A transmission word that uses 8b/10b mapping and begins with the K28.5 character. Ordered sets occur outside of frames and include the following items: Frame delimiters-Mark frame boundaries and describe frame contents. Primitive signals-Indicate events. Primitive sequences-Indicate or initiate port states. Ordered sets are used to differentiate Fibre Channel control information from data frames and to manage frame transport. originator The Nx_Port that originated an exchange. out-of-band Transmission of management protocol outside of the Fibre Channel network, usually over Ethernet. out-of-box switch A switch coming from the factory without any customized settings. EZSwitchSetup determines that a switch is an out-of-box switch if the passwords of all of the default accounts (root, factory, admin, and user) are set to the default passwords. oversubscription A situation in which more SAN devices could potentially contend for a resource than the resource could simultaneously support (typically an ISL). Oversubscription could be a desirable attribute in fabric topology, as long as it does not produce unacceptable levels of congestion. 22 Brocade Glossary Publication Number: 53-1000040-03