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Performance |
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3.3
Performance
The
Distance
Bandwidth
Latency
3.3.1
Distance
Consider the physical distribution of devices and switches in the fabric. Choose SFP transceivers that are compatible with the cable type, distance, Fibre Channel revision level, and the device host bus adapter. Refer to
Appendix A Specifications for more information about cable types and SFP transceivers.
Each port is supported by a data buffer with a 12 credit capacity; that is, 12 maximum sized frames. For fibre optic cables, this enables full bandwidth over a distance of 20 kilometers at
Longer distances can be spanned at full bandwidth by extending credits on G_Ports and F_Ports. Each port can donate 11 credits to a pool from which a recipient port can borrow. For example, you can configure a recipient port to borrow up to 66 credits from 6 ports for a total of 78 credits. This will support communication over approximately 130 Km at 1 Gbps (78÷0.6) or 65 Km at 2 Gbps (78÷1.2).
You can configure recipient and donor ports using SANsurfer Switch Manager or the Set Config command. Refer to “Set Config Command” on page