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Exadata - Verify Ethernet Cable Connection Quality


Benefit / Impact:

Ethernet cables require proper connections for optimal efficiency. Verifying the Ethernet cable connection quality helps to ensure that the Ethernet network operates at optimal efficiency.

There is minimal impact to verify Ethernet cable connection quality.


Ethernet cables that are not properly connected may negotiate to a lower speed, work intermittently, or fail.

Action / Repair:

Execute the following command as the root userid on all database and storage servers:

for cable in `ls /sys/class/net | grep ^eth`; do printf "$cable: "; cat /sys/class/net/$cable/carrier; done

The output should look similar to:

eth0: 1

eth1: cat: /sys/class/net/eth1/carrier: Invalid argument

eth2: cat: /sys/class/net/eth2/carrier: Invalid argument

eth3: cat: /sys/class/net/eth3/carrier: Invalid argument

eth4: 1

eth5: 1

"Invalid argument" usually indicates the device has not been configured and is not in use. If a device reports "0", investigate that cable connection.

NOTE: Within machine types, the output of this command will vary by customer depending on how the customer chooses to configure the available ethernet cards.


Ref. Doc ID 1274318.1

Posted on : 4/20/2018 by Anuj
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