Windows Reliability Analysis Engine Registry Key

The Windows Reliability Analysis Component (RAC) is a background engine that calculates the system stability index and generates data for Reliability Monitor. Its core operational configuration, metrics tracking, and status parameters are primarily stored in the Windows Registry under the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Reliability Analysis\RAC key. This article details the exact registry location, the primary values managed by the engine, and how these settings control system reliability tracking.

Primary Registry Path

To view or configure the Reliability Analysis Component directly in the Registry Editor (regedit.exe), navigate to the following path:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Reliability Analysis\RAC

Key Configuration Values

Within this key, Windows maintains several DWORD and String values that dictate how reliability data is processed and reported:

• RacStatus: Indicates the operational status of the Reliability Analysis Component (typically set to 1 when active).
• RacIsRunning: A flag tracking whether the reliability calculation task is currently running.
• WmiTime: Tracks timestamp data related to the ingestion of Windows Management Instrumentation (WMI) system events.
• RacEnterpriseMetrics: Used in managed environments to determine whether metrics are uploaded to enterprise diagnostics endpoints.

Group Policy Registry Path

If the Reliability Analysis Engine is managed via Group Policy or Mobile Device Management (MDM), configuration overrides are stored in the policy-specific registry path:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\RAC

Setting policy parameters in this key (such as RacStatus or RacDisable) allows administrators to globally enable or disable reliability data collection across multiple machines.

Related System Components

The registry configuration directly interacts with the scheduled maintenance task located at Task Scheduler > Task Scheduler Library > Microsoft > Windows > RAC > RacTask. When this task runs, it references the parameters defined in the registry to parse event logs, calculate the stability index (ranging from 1 to 10), and populate the graphical view inside the built-in Windows Reliability Monitor (perfmon /rel).