Troubleshooting guide

• The M3-CLOS-ENCL-B (or M3-SPINE-ENCL-B) enclosure contains two 840W

power supplies that can be individually hot-swapped, and operate in an auto-

parallel mode in which any one power supply is sufficient to supply the maximum

power a unit may require.

• Two fan assemblies are included in each M3-CLOS-ENCL-* and M3-SPINE-

ENCL-* enclosure, and they can be individually hot-swapped.

• The line cards, the power supplies, and the fan assemblies, are Field Replaceable

Units (FRU).

• We recommend the use of dust plugs in unused ports on the switch, and require

blank panels (M3-AIRDAM) in unused slots (for cooling and EMI reasons).

• You must provide proper ventilation for the switch(es), otherwise shutdown due to

overheating could occur.

After reading these guides, you should be aware of the following important information

and precautions pertaining to Myrinet-2000 cables:

• Fiber-cable ends and ports on line cards must be kept free of dust particles.

Accumulation of dust can cause faults from the port-to-fiber connection.

• Myrinet-2000 fiber cables are 50/125 multimode fiber pairs with LC connectors.

Myricom does not guarantee correct operation with other than 50/125 fiber cables.

• Myrinet-2000 quad-link ribbon fiber cables for inter-switch connections on the M3-

CLOS-ENCL and M3-SPINE-ENCL enclosures are industry-standard cables with

MTP/MPO fiber connectors on each end.

• Myrinet-2000 cables are hot-pluggable.

• Myrinet-2000 fiber cables should be disconnected by carefully depressing the

connector tab, otherwise damage can result.

• Myrinet-2000 quad-link ribbon fiber cables should be disconnected by pulling back

the beige sleeve/latch on the black connector. No force whatsoever should be

applied to the cable itself.

• Avoid crimping cables (bending at tight angles) as damage can result. The

minimum bend radius for fiber cables is a "finger width" (or 1/4" radius).

• You should provide support restraints for cabling of large cluster configurations.

E.g.,

• http://www.phys.lsu.edu/faculty/tohline/capital/beowulf.html