ServerNet Cluster 6780 Planning and Installation Guide (G06.24+, H06.03+)

Planning for Installation and Migration
ServerNet Cluster 6780 Planning and Installation Guide—527301-004
3-15
Task 7: Plan for the Fiber-Optic Cables
Planning the Location of the 6780 Switches
To reduce cabling errors, HP recommends that you install the X-fabric and Y-fabric
switches with some distance between them. Do not install switches for different fabrics
in the same rack as there is a higher potential for miscabling.
Each switch must be located so that:
•
The power cords can reach the UPS, PDU, or external power source.
•
The fiber-optic cables can reach the nodes.
•
The fiber-optic cables can reach the switches in the other layers and zones.
Task 7: Plan for the Fiber-Optic Cables
You must carefully plan the fiber-optic cables so that you have the correct number,
connectors, type, and length of cables to support the ServerNet cluster:
•
When migrating from a ServerNet cluster with 6770 switches, you must replace all
fiber-optic cables.
•
Other types of cables such as FOX ring fiber-optic cables and ATM cables are not
supported for use in a ServerNet cluster.
•
Depending on the type of PICs in slots 2 and 3, either SMF or MMF cables are
supported for connections between zones.
•
If you use fiber-optic cables that are not provided by HP, the cables must meet the
specifications in Fiber-Optic Cable Specifications on page D-2.
Table 3-9 on page 3-16 describes the type of fiber and connector for each cable and
how to determine the correct number and length for each cable required.
Caution. Do not exceed the 80-meter maximum cable length between a ServerNet node and
a switch. Doing so can cause multiple, unrecoverable ServerNet communication failures to and
from the node that is in violation of the distance limit.