I had the misfortune of having to provide proof that one of our production system’s reliability/up-time could not be questioned after an outage that lasted an entire weekend. Without proper monitoring software in place I was left to dig through the reliability monitor. But when I opened Reliability Monitor it was empty!

This behavior occurs because the trigger that regularly starts the RacTask task is disabled.

To resolve this issue, follow these steps:

  1. Click Start, type Task Scheduler in the Search box, and then click Task Scheduler.
  2. Enable the trigger that regularly starts the RacTask task.
    1. In Task Scheduler, expand Task Scheduler Library, expand Microsoft, and then expand Windows.
    2. Right-click RAC, click View, and then click to select the Show Hidden Tasks command.Note If the Show Hidden Tasks command is already selected, go to step 2c.
    3. Double-click RacTask.
    4. In the RacTask Properties dialog box, click the Triggers tab.
    5. On the Triggers tab, double-click the One time trigger.
    6. In the Edit Trigger dialog box, click to select the Enabled option, and then click OK.
    7. In the RacTask Properties dialog box, click OK.
    8. Close Task Scheduler.
  3. Update a registry setting.
    1. Click Start, type Regedit in the Search box, and then click Regedit.
    2. In Registry Editor, set the value of the following registry entry to 1:
      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Reliability Analysis\WMI\WMIEnable
  4. Restart the computer.

Never again! 😀 (although I usually never say never)

Reference:
http://support.microsoft.com/kb/983386

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