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This error could also be caused by an a NEXIS Degrade. Open up your NEXIS Management console in your web browser and you will see a Storage Manager error that the network is degraded. When the system gets too many network errors it pauses writing to the drives until it can recover....
Other things to check are that your switch has the correct config file and no ports are throwing errors.
Another cause is a bad ethernet cable or one that simply isn't plugged in all the way. We replaced every cable with Cat6 and we went from daily errors to once a week.
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