How to Monitor for Network Subsystem Bottlenecks

Article:TECH10583  |  Created: 2001-01-10  |  Updated: 2002-01-11  |  Article URL http://www.symantec.com/docs/TECH10583
Article Type
Technical Solution

Issue



How to Monitor for Network Subsystem Bottlenecks

Solution



When monitoring for potential network bottlenecks, items such as the network bandwidth that is used on a network segment and the rate at which the server is transmitting bytes through the network can be monitored.  Use the following objects and counters to identify network bottlenecks.

    Network Segment Object
      For the Network Segment Object, monitor the counter described below:

        % Net Utilization
          Shows the percentage of network bandwidth in use on a network segment.  The threshold must be determined based on the type of network used. For example, for Ethernet networks, 30 percent is the recommended threshold.

    Redirector Object
      For the Redirector object, monitor the counters described below:

        Bytes Total / sec
          Provides the number of bytes per second sent and received by the network redirector.  By comparing the maximum throughput of the network card with the maximum value of this counter, this counter determines if the network traffic is a bottleneck in the system.

        Network Errors / sec
          Measures the number of unexpected errors the redirector receives.  If network problems are suspected, verify that this counter is above zero.  If it is above zero, the system log may be helpful by providing details on the network error.

    Server Object
      For the Server Object, monitor the counters described below:

        Bytes Total / sec
          Shows the rate at which the server is transmitting bytes through the network.  If the sum of Bytes Total / sec for all servers is almost equal to the maximum transfer rates of the network, then this network may need to be segmented.

        Work Item Shortages
          Shows the number of times STATUS_DATA_NOT_ACCEPTED is returned. This occurs when no work item is available or can be allocated to service the incoming request.  If the value reaches approximately 3, consideration should be taken to tuning InitWorkItems or MaxWorkItems entries in the Registry  (in HKEY_LOCAL_MACHINE\SYSTEM\
          CurrentControlSet\Services\lanmanserver\Parameters
          ).

        Pool Paged Peak
          Indicates the proper sizes for the paging file and the amount of physical memory.

    Server Work Queues Object
      For the Server Work Queue object, monitor the counters described below:

        Queue Length
          Shows the current length of the server work queue for a processor.  If the value reaches approximately 4, there may be a processor bottleneck.  Queue Length is an instantaneous counter. This value needs to be observed over several intervals to determine whether there is a problem.



Legacy ID



235821


Article URL http://www.symantec.com/docs/TECH10583


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