HP Surestore 64 Planning Guide - Page 90

repeater function. However, cost may be a determining factor.

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connections. In addition, each director in the fabric must be assigned a unique preferred domain ID. When planning to implement a fabric topology, consider the following connectivity and cabling concepts: • Physical characteristics and performance objectives Most enterprises have unique configurations determined by the characteristics of end devices, fabric elements, cost, and the installation's performance objectives (such as high data transfer rate or high availability). These factors, along with nondisruptive growth and service requirements, must be evaluated when planning an initial fabric. • Distance requirements The distance between directors in a fabric affects the type of ISL required. Consider the following: - If the distance between two directors is less than 175 meters, any port type (shortwave or longwave laser) and any fiber-optic cable type (multimode or single mode) can be used to create an ISL connection. In this case, cost or FPM card availability may be the determining factor. - If the distance between two directors exceeds 500 meters, only longwave laser ports and singlemode fiber-optic cable can be used to create an ISL connection. - Distance limitations can be increased and port type restrictions eliminated by using multiple directors. Each director retransmits received signals, thus performing a repeater function. However, cost may be a determining factor. Note Variables such as the number of connections, grade of fiber-optic cable, device restrictions, application restrictions, buffer-to-buffer credit limits, and performance requirements can affect distance requirements. • Bandwidth ISL connections can be used to increase the total bandwidth available for data transfer between two directors in a fabric. Increasing the number of ISLs between switches increases the corresponding total ISL bandwidth, but decreases the number of port connections available to devices. Table 2 illustrates ISL transfer rate versus port availability for a two-switch fabric. 76 Multiswitch Fabric Support

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76
Multiswitch Fabric Support
connections. In addition, each director in the fabric must be assigned a unique preferred
domain ID. When planning to implement a fabric topology, consider the following
connectivity and cabling concepts:
•
Physical characteristics and performance objectives
Most enterprises have unique configurations determined by the characteristics of end
devices, fabric elements, cost, and the installation
’
s performance objectives (such as
high data transfer rate or high availability). These factors, along with nondisruptive
growth and service requirements, must be evaluated when planning an initial fabric.
•
Distance requirements
The distance between directors in a fabric affects the type of ISL required. Consider
the following:
–
If the distance between two directors is less than 175 meters, any port type
(shortwave or longwave laser) and any fiber-optic cable type (multimode or single
mode) can be used to create an ISL connection. In this case, cost or FPM card
availability may be the determining factor.
–
If the distance between two directors exceeds 500 meters, only longwave laser ports
and singlemode fiber-optic cable can be used to create an ISL connection.
–
Distance limitations can be increased and port type restrictions eliminated by using
multiple directors. Each director retransmits received signals, thus performing a
repeater function. However, cost may be a determining factor.
Note
Variables such as the number of connections, grade of fiber-optic cable, device
restrictions, application restrictions, buffer-to-buffer credit limits, and
performance requirements can affect distance requirements.
•
Bandwidth
ISL connections can be used to increase the total bandwidth available for data transfer
between two directors in a fabric. Increasing the number of ISLs between switches
increases the corresponding total ISL bandwidth, but decreases the number of port
connections available to devices. Table 2 illustrates ISL transfer rate versus port
availability for a two-switch fabric.