XenServer NIC outbound traffic (consecutive samples)

Summary

The write (outbound) traffic on a server’s network card is high.

Configuration

The following configuration parameters are customizable:

• IntervalSeconds - The recurring interval of time in seconds in which to run the script (the default value is set to 300 seconds).

• NumberOfSamples - The number of event occurrences before monitor state changes will be triggered (the default value is set to 3).

• Threshold - The value that defines the warning threshold to be used in the comparison (the default value is set to 500 Mbps).

Causes

A network card may have a high amount of write (outbound) traffic on the server.

Resolutions

Consider the following solutions to reduce the write (outbound) traffic:

• Check whether the write traffic is high for longer periods of time.

• Check whether the write traffic is high on individual or all network cards.

• Check whether the write traffic is related to a specific virtual machine or is a cumulative result of all virtual machines.

• Check whether you can redirect some of the write traffic to other network cards on the server.

Additional

High write (outbound) network traffic can be a result of a virtual machine activity or the server activity when writing to the shared storage.

External

For more information, see the “Citrix XenServer Administrator’s Guide”, the section on networking.