Diagnosing Network Issues

A multi-host grid is dependent on a fast network in order to perform well. A Gigabit network between grid hosts is strongly recommended. Strange intermittent problems on one host at the same time that application instances on another host have no problems may be an indication that the host is having network problems.

Diagnosing the network may be done with tools external to the ION Grid but the grid provides ways of measuring the network performance and it is always a good idea to perform that test when network problems are suspected.

To diagnose network issues

  1. Navigate to the Topology View page in the Grid Management pages.
  2. Click the Advanced link at the top of the page.
  3. Click the Network Diagnostics link.
  4. You will be presented with three tests. Start by running the firewall check and view its result. If the firewall check implies that there is a problem with one of the firewalls, address that issue before running the other two tests. Otherwise run the remaining two tests and look for results that look unusual.