glossary hp StorageWorks directors and edge switches Product Version: FW V05.01.00-24/HAFM SW V07.01.00-09 First Edition (June 2003) Part Number: AA-RU5JA-TE This glossary defines terms used in manuals that support HP StorageWorks directors and edge switches.
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glossary Glossary This glossary defines terms used in manuals that support the following HP StorageWorks storage area network (SAN) products: ■ Director 2/64 ■ Director 2/140 ■ Edge Switch 2/16 ■ Edge Switch 2/24 ■ Edge Switch 2/32 Glossary The glossary includes terms that relate specifically to the supported products. It does not include many terms that are generally well-known in the SAN industry.
Glossary agent Software that processes queries on behalf of an application and returns replies. alarm Simple network management protocol (SNMP) message notifying an operator of a network or device problem. allowed connection In S/390 mode in a director or switch, the attribute that, when set, establishes dynamic connectivity capability. See also blocked connection, connectivity attribute, dynamic connectivity, and unblocked connection.
Glossary backplane The backplane provides 48 VDC power distribution and connections for all logic cards. backup FRU When an active field-replaceable unit (FRU) fails, an identical backup FRU takes over operation automatically (failover) to maintain director and Fibre Channel link operation. See also active FRU. BB_Credit See buffer-to-buffer credit. beaconing Use of light-emitting diodes on ports, port cards, field-replaceable units, and directors to aid in the fault-isolation process.
Glossary bridge port (B_Port) — (1) In Fibre Channel protocol, a fabric inter-element port used to connect bridge devices with E_Ports on a switch. B_Ports provide a subset of E_Port functionality. (2) A term for a physical interface between the fabric (switch) and a bridge device. The interface is identical to an expansion port (E_Port), but it does not participate in full expansion port protocols. As such, it does not assign domain IDs or participate in routing protocol.
Glossary channel wrap test A diagnostic procedure that checks S/390 host-to-director connectivity by returning the output of the host as input. The test is host-initiated, and transmits Fibre Channel frames to a director port. A director port enabled for channel wrapping echoes the frame back to the host. Class 2 Fibre Channel service Provides a connectionless (not dedicated) service with notification of delivery or nondelivery between two N_Ports. In-order delivery of frames is not guaranteed.
Glossary connectionless Nondedicated link. Typically used to describe a link between nodes that allows the switch to forward Class 2 or Class 3 frames as resources (ports) allow. Contrast this type of link to the dedicated bandwidth that is required in a Class 1 Fibre Channel Service point-to-point link. connectivity attribute In S/390 mode, the characteristic that determines port address status for the director or switch.
Glossary cyclic redundancy check (CRC) — System of error checking performed at both the sending and receiving station using the value of a particular character generated by a cyclic algorithm. When the values generated at each station are identical, data integrity is confirmed. DASD Direct access storage device, such as a disk drive. datagram See Class 3 Fibre Channel service. data directory Directory that contains critical information for all managed products (including directors and switches).
Glossary director An intelligent Fibre Channel switching device providing any-to-any port connectivity between nodes (end devices) on a switched fabric. The director sends data transmissions (data frames) between nodes in accordance with the address information present in the frame headers of those transmissions. DNS name Domain name system (or domain name service). Host or node name for a device or managed product that is translated to an internet protocol (IP) address through a domain name server.
Glossary error message Software message that indicates an error was detected. See also information message and warning message. Ethernet A widely implemented local area network (LAN) protocol that uses a bus or star topology and serves as the basis for the IEEE 802.3 standard, which specifies the physical and software layers. Baseband LAN allows multiple station access to the transmission medium at will without prior coordination and which avoids or resolves contention.
Glossary fabric login The process by which node ports (N_Ports) establish their operating parameters. During fabric login, the presence or absence of a fabric is determined and paths to other N_Ports are mapped. Specific operating characteristics for each port, such as buffer-to-buffer credit (BB_Credit) and data frame size, are also established. fabric port (F_Port) — Physical interface within the fabric that connects to an N_Port through a point-to-point full duplex connection.
Glossary fiber optics Branch of optical technology concerned with the transmission of light pulses through fibers made of transparent materials such as glass, fused silica, and plastic. fiber port module card A 1 gigabit per second module that contains four generic ports (G_Ports). Each fiber module card provides connections through duplex small form factor pluggable (SFP) fiber optic transceivers. FICON An IBM set of products and services introduced in 1999 that is based on the Fibre Channel Standard.
Glossary G_Port See generic port. HAFM application See High Availability Fabric Manager application. HAFM server See High Availability Fabric Manager server. hardware log Record of FRU insertions and removals for a director or switch. hardware management console The console runs the Hardware Management Console application (HWMCA), and is the operations and management PC platform for S/390 and zSeries servers. HBA See host bus adapter.
Glossary hot-swapping Removing and replacing a device’s components while the device continues to operate normally. hub In Fibre Channel protocol, a device that connects nodes into a logical loop by using a physical star topology. In an Ethernet system, a device used to connect the HAFM server and the directors it manages. IML See initial machine load. inband management Management of the director or switch through a Fibre Channel connection to a port card. See also out-of-band management.
Glossary interoperability Ability to communicate, execute programs, or transfer data between various functional units over a network. interoperability mode (interop mode) — An operating mode, set through management software, that allows products to operate in homogeneous or heterogeneous fabrics. interswitch link (ISL) — Physical expansion port (E_Port) connection between two directors in a fabric. IOCDS A data set that contains an I/O configuration definition built by the IOCP.
Glossary link incident log Log, displayed through the Product Manager application, that provides a history of Fibre Channel link incidents (with associated port numbers) for an individual director or switch. See also audit log, event log, hardware log, and threshold alert log. load balancing Ability to evenly distribute traffic over multiple interswitch links within a fabric. Load balancing on HP directors takes place automatically.
Glossary managed product Hardware product that can be managed with the HAFM application. For example, the Director 2/64 and the Edge Switch 2/32 are managed products. See also device. Management Information Base (MIB) — Related set of software objects (variables) containing information about a managed device and accessed via SNMP from a network management station. Management Services application Software application that provides back-end product-independent services to the HAFM application.
Glossary network address Name or address that identifies a managed product on a transmission control protocol/internet protocol (TCP/IP) network. The network address can be either an IP address in dotted-decimal notation (containing four three-digit octets in the format xxx.xxx.xxx.xxx), or a domain name (as administered on a customer network). never principal The setting that prevents the product from becoming the principal switch for a fabric.
Glossary 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. See also offline state.
Glossary password Unique string of characters known to the computer system and to a user who must specify it to gain full or limited access to a system and to the information stored within it. path In a network, any route between any two ports. persistent binding A form of server-level access control that uses configuration information to bind a server to a specific Fibre Channel storage volume (or logical device) using a unit number.
Glossary product name User-configurable identifier assigned to a managed product. Typically, this name is stored on the product itself. For the director, the product name can also be accessed by an SNMP manager as the system name. prohibited port connection In S/390 operating mode, an attribute that removes dynamic connectivity capability. R_A_TOV See resource allocation time-out value.
Glossary segmented E_Port Expansion 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 expansion port. serial crossbar assembly (SBAR) — Responsible for Fibre Channel frame transmission from any director port to any other director port. Connections are established without software intervention. SFF (small form factor) — A type of Fibre Channel connector). See also fiber port module card.
Glossary switch priority Value configured into each switch in a fabric that determines its relative likelihood of becoming the fabric’s principal switch. system automation for operating system 390 (SA OS/390) — IBM-licensed software that provides System/390 Parallel Sysplex management, automation capabilities, and integrated systems and network management. SA OS/390 manages host, remote processor, and I/O operations.
Glossary unblocked port Devices attached to an unblocked port can log in to the director and communicate with devices attached to any other unblocked port. unicast Communication between a single sender and a single receiver over a network. Compare to multicast and anycast (communication between any sender and the nearest of a group of receivers). See also multicast.
Glossary zone set See also zone. zoning Grouping of several devices by function or by location. All devices connected to a connectivity product, such as the director, may be configured into one or more zones. See also zone.
