HP Surestore Tape Library Model 6/60 SAN Solution Installation Guide - Page 14

Topologies

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Topologies and Components Topologies Topologies Topology describes the way nodes on a network are connected. These nodes can be servers and storage systems, as well as interconnected devices such as hubs, switches and bridges. Types of topologies include: • Point-to-Point - A dedicated Fibre Channel connection between two devices. • Arbitrated Loop - A shared 100MBps Fibre Channel transport supporting up to 126 devices and one fabric attachment. • Switched Fabric - One or more switches providing higher level services and switched 100MBps bandwidth per port. Maximum number of nodes = 16 million addresses +/-, maximum bandwidth = 100MBps/ x nodes. Point-to Point is the most simple of SAN connectivity topologies that allows bi-directional communication between two nodes, such as a server and tape library. Between these two nodes is a dedicated fiber-optic connection. Arbitrated Loop is a continuous ring configuration where each node translates or passes data to adjacent nodes. The SAN hub arbitrates requests for data to make optimum use of the available bandwidth. Switched Fabric is a new term established to support fiber-optic SAN technology and describes extensive storage networks where numerous servers and storage devices are connected using fiber-optic switches. These switches can be cascaded and combined with loops to create interwoven networks known as fabrics. This configuration is managed by software that uses the SAN management capabilities that are built directly into the fabric scheme. 1-4 Chapter 1

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Topologies and Components
Topologies
Chapter 1
1-4
Topologies
Topology describes the way nodes on a network are connected. These
nodes can be servers and storage systems, as well as interconnected
devices such as hubs, switches and bridges.
Types of topologies include:
•
Point-to-Point
- A dedicated Fibre Channel connection between two
devices.
•
Arbitrated Loop
- A shared 100MBps Fibre Channel transport
supporting up to 126 devices and one fabric attachment.
•
Switched Fabric
- One or more switches providing higher level
services and switched 100MBps bandwidth per port. Maximum
number of nodes = 16 million addresses +/-, maximum bandwidth =
100MBps/ x nodes.
Point-to Point
is the most simple of SAN connectivity topologies that
allows bi-directional communication between two nodes, such as a server
and tape library. Between these two nodes is a dedicated fiber-optic
connection.
Arbitrated Loop
is a continuous ring configuration where each node
translates or passes data to adjacent nodes. The SAN hub arbitrates
requests for data to make optimum use of the available bandwidth.
Switched Fabric
is a new term established to support fiber-optic SAN
technology and describes extensive storage networks where numerous
servers and storage devices are connected using fiber-optic switches.
These switches can be cascaded and combined with loops to create
interwoven networks known as fabrics. This configuration is managed by
software that uses the SAN management capabilities that are built
directly into the fabric scheme.