NEC ExpEther-2S, Руководство пользователя

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Chapter 9. Troubleshooting
If this product does not work correctly, check it according to the contents of the following checklist before
sending it for repair. If an item in the checklist corresponds with a problem you are experiencing, follow the
subsequent check and processing instructions.
9.1 Common problems of ExpEther series products

The power does not turn on.
□Is the power properly supplied to the unit?
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Check that you have connected the power cord of the server to the outlet (or UPS
(uninterruptible power system)) that conforms to the power standard.
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Check that the power cord is properly connected to the ExpEther IO Expansion Unit (40G).
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Check that the power cord of the ExpEther IO Expansion Unit (40G) is properly connected to
the outlet.
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Use the power cord attached to the unit. Check that the coating of the power cord or the plug
is broken.
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Check that the breaker of the connected outlet is turned on.
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Check that the main power switch of the ExpEther IO Expansion Unit (40G) is turned on.
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If you connect it to a UPS, check that the power of the UPS is turned on and the UPS outputs
the power. Refer to the instruction manual attached to the UPS.

LINK unsuccessful
□Is the network cable correctly connected?
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Check if the cable is firmly attached to the LAN port or the QSFP+ port of the ExpEther
product and the link partner (such as switches).
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Check if the power of the link partner (such as switches) is turned on.
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If you use the non-standard cable, damaged interface cable, excessively bent cable and that
crushed under the heavy object, you may not get into communication. In that case, try to use
other cables.

The ExpEther board and the ExpEther IO device do not get connected.
□ Is the Group ID correctly set?
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To get the ExpEther board (40G) and the ExpEther IO Expansion Unit (40G) connected, you
need to set the Group ID of the ExpEther board (40G) and the ExpEther IO Expansion Unit
(40G) to the same value. Check the Group ID setting.
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If you have multiple ExpEther boards (40G) connected on the same network, check if the
Group IDs of the ExpEther boards (40G) is redundant. If you find redundant Group IDs of the
ExpEther boards (40G), set them again to avoid redundancy.

The performance of the connected ExpEther IO device is low.
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If you use only one connection port, use two ports to change to multi-path connection and
check how it works.
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Check the delay time of the network environment including network switches. The
performance may reduce in the network environment where you find a significant delay time.
To improve the performance, it is effective to improve the delay time of the network.
Therefore, reduce the number of steps of the connected network switch and change the
network switch to that whose delay time is less.

The product does not correctly operate if you pull out and insert the QSFP+ cable during
operation.
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Check if the server is compatible with the PCI Express hot plug feature.
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To pull out and insert the QSFP+ cable during operation, the server mounting the ExpEther
board (40G), OS, devices mounted on the ExpEther IO Expansion Unit (40G), and the driver
need to be compatible with the PCI Express hot plug feature.