HP Surestore 64 Planning Guide - Page 20

Multiple service class support

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- An arbitrated loop topology connects multiple device node loop ports (NL_Ports) in a loop (or hub) configuration without benefit of a multiswitch fabric. Although the director does not support direct connection of arbitrated loop devices, such devices can communicate with the director through heterogeneous Fibre Channel devices. Contact your local HP sales office for supported devices. • Multiple service class support The Fibre Channel signaling protocol provides several classes of transmission service that support framing protocol and flow control between ports. The director supports Class 2, Class 3, and Class F services. The HP-UX operating system does not support multicast or broadcast modes. - Class 2 transmission service provides connectionless multiplexed frame delivery service with acknowledgment. This service duplicates the functions of a packetswitching network, and allows multiple nodes to share links by multiplexing the transmitted data. Multiplexing is supported from a source to multiple destinations, or from a destination to multiple sources. Data is adaptively transferred frame-byframe between pairs of N_Ports through an undedicated path. In the absence of link errors, frame delivery is guaranteed with confirmation of receipt. Class 2 Service is best suited for mainstream computing applications. - Class 3 transmission service provides connectionless, best-effort multiplexed datagram frame delivery with no acknowledgment. This class of service is the same as Class 2 service; however confirmation of receipt is not given. The service allows data transmission with great flexibility and efficiency. However, data frames may be discarded without notification if high-traffic or error conditions are encountered. If a data frame is discarded or corrupted, error recovery or notification (if any) is performed at the upper level protocol (ULP) level. Class 3 service is best suited for mass storage or video applications. - Class F transmission service is connectionless service similar to Class 2 service. This service multiplexes control frames at frame boundaries and is used by multiple directors to communicate across interswitch links (ISLs) to configure, control, and coordinate the behavior of a multiswitch fabric. 6 Director Overview

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6
Director Overview
–
An arbitrated loop topology connects multiple device node loop ports (NL_Ports) in
a loop (or hub) configuration without benefit of a multiswitch fabric. Although the
director does not support direct connection of arbitrated loop devices, such devices
can communicate with the director through heterogeneous Fibre Channel devices.
Contact your local HP sales office for supported devices.
•
Multiple service class support
The Fibre Channel signaling protocol provides several classes of transmission service
that support framing protocol and flow control between ports. The director supports
Class 2, Class 3, and Class F services. The HP-UX operating system does not support
multicast or broadcast modes.
–
Class 2 transmission service provides connectionless multiplexed frame delivery
service with acknowledgment. This service duplicates the functions of a packet-
switching network, and allows multiple nodes to share links by multiplexing the
transmitted data. Multiplexing is supported from a source to multiple destinations,
or from a destination to multiple sources. Data is adaptively transferred frame-by-
frame between pairs of N_Ports through an undedicated path. In the absence of link
errors, frame delivery is guaranteed with confirmation of receipt. Class 2 Service is
best suited for mainstream computing applications.
–
Class 3 transmission service provides connectionless, best-effort multiplexed
datagram frame delivery with no acknowledgment. This class of service is the same
as Class 2 service; however confirmation of receipt is not given. The service allows
data transmission with great flexibility and efficiency. However, data frames may be
discarded without notification if high-traffic or error conditions are encountered. If
a data frame is discarded or corrupted, error recovery or notification (if any) is
performed at the upper level protocol (ULP) level. Class 3 service is best suited for
mass storage or video applications.
–
Class F transmission service is connectionless service similar to Class 2 service. This
service multiplexes control frames at frame boundaries and is used by multiple
directors to communicate across interswitch links (ISLs) to configure, control, and
coordinate the behavior of a multiswitch fabric.