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Old 08-22-2008, 10:25 AM   #1
Sanford Stein
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Registered: Jun 2008
Location: Evanston, Illinois
Distribution: RHEL 6.4
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rx_crc_errors from ethtool


I run 'ethtool -S' every morning and this morning I got 1500+ rx_crc_errors. This is the first time that this parameter has been non-zero.

Question 1: Is this a cumulative result? If so, starting when?
Question 2: What exactly is a rx_crc_error? Is my NIC card going bad?

Thanks,
Sanford Stein
CyberTools Inc.
 
Old 08-23-2008, 06:56 PM   #2
Mr. C.
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Ethtool stats are from the time the driver was instantiated (eg. loaded and inited).

RX means receive. CRC is cyclic redundancy check, a mathematical calculation that is used to identify errors in a packet.

This may indicate a hardware problem such as a cable problem, fault switch port, or other. Start first by replacing the cable.
 
Old 08-25-2008, 04:43 PM   #3
Sanford Stein
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rx_crc_errors

Followup question for Mr. C or whoever else is listening:

If I am getting tx_error_bytes when running ethtool on one server in a communications link, and rx_crc_errors when running ethtool on the other, which NIC card is the most likely culprit? (We tried switching cables and the errors are still coming.)

Thanks,
SS
 
Old 08-25-2008, 07:15 PM   #4
Mr. C.
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Not sure. Can you describe how each device is connected to the other devices?
 
Old 08-26-2008, 11:41 AM   #5
Sanford Stein
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Mr C:

Thanks again for your quick response.

We had a third server in-house, so we tested the communication between servers 1 and 3, and then between 2 and 3, and this identified the NIC card on system 2 as the culprit and we will get a replacement from Dell.

SS
 
Old 08-26-2008, 11:47 AM   #6
Mr. C.
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Nice work isolating the hardware problem.
 
Old 04-09-2009, 12:49 AM   #7
kamalsivadas
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driver name??

[QUOTE=Sanford Stein;3256013]I run 'ethtool -S' every morning and this morning I got 1500+ rx_crc_errors. This is the first time that this parameter has been non-zero.

Question 1: Is this a cumulative result? If so, starting when?
Question 2: What exactly is a rx_crc_error? Is my NIC card going bad?


Can you tell which driver you used to get 'ethtool -S' result??
The result is completely depends on driver!!.If you know any of the driver which supports all options of ethtool mention that also???
 
  


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