ServerNet Cluster 6770 Hardware Installation and Support Guide

Planning for the ServerNet Cluster Switch
ServerNet Cluster 6770 Hardware Installation and Support Guide—522544-002
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Planning for Cable and Power Cord Connections
Planning for Cable and Power Cord
Connections
Because the ServerNet Cluster Switch requires many cables and power cords, careful
planning is essential.
Choosing Fiber-Optic ServerNet cables
When choosing a cable length, consider the cable length distance needed between the
ServerNet Cluster Switch enclosure or standard rack and the group 01 processor
enclosures of the nodes to be added to the ServerNet cluster:
•
The fiber-optic ServerNet cables are part of a large bundle of cables and cords
attached to a cable-management assembly in either the ServerNet Cluster Switch
enclosure or rack. Allow an extra 1.5 meters of cable length when estimating the
distance between the ServerNet Cluster Switch and each of the nodes.
•
The cable length needed varies depending on whether the ServerNet Cluster
Switch faces the same way as a group 01 processor enclosure or if the enclosure
faces the opposite direction.
•
Allow additional cable length if the cable must cross a service aisle. In addition to
considering the width of the service aisle, consider the additional length needed if
the cable must extend down the other row to reach the group 01 processor
enclosure.
•
Estimate the amount of cable slack that is needed beneath a raised floor.
•
HP provides fiber-optic ServerNet cables in 10-meter, 40-meter, and 80-meter
lengths.
•
To minimize cable length, place each ServerNet Cluster Switch as close as
possible to the nodes it will be connected to.
•
80 meters is the maximum cable distance between a ServerNet II Switch and the
MSEBs in each node. However, the maximum cable distance between nodes
varies depending on the number of ServerNet II Switches per fabric.