HP 316095-B21 - StorageWorks Edge Switch 2/24 Manuale - Pagina 8

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Glossary

channel path identifier

(CHPID) — In a channel subsystem, a value assigned to each installed channel path of the

system that uniquely identifies that path to the system.

channel-to-channel

CTC. A channel attached to another channel (channel-to-channel) and specifies the I/O mode of

operation for the channel path under the I/O configuration program (IOCP) channel path

identifier (CHPID) statement 'Type' parameter. See also

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.

CHPID

See

channel path

identifier.

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.

Class 3 Fibre Channel service

Provides a connectionless (not dedicated) service without notification of delivery or

nondelivery between two N_Ports. Also known as datagram.

Class F Fibre Channel service

Used by switches to communicate across interswitch links (ISLs) to configure, control, and

coordinate a multiswitch fabric.

class of Fibre Channel service

Defines the level of connection dedication, acknowledgment, and other characteristics of a

connection. Class 2, Class 3, and Class F services are supported.

client/server computing

Architectural model that functionally divides that execution of a unit of work between activities

initiated by an end user or program (client) and those maintaining data (servers). Originally

thought to make mainframes obsolete.

cluster

A group of processors interconnected by a high-speed network (typically dedicated) for

increased reliability and scalability. Clusters are groupings of multiple servers in which

information is shared among systems. When a server in a cluster fails, one of the other servers

in the cluster assumes the responsibility of the failed server, thereby ensuring server,

application, and data availability.

channel path

identifier.

Directors and Edge Switches Glossary