Policy
NTFS parallel flush worker threads
Microsoft Windows
Policy overview
Key metadata and intent for this policy.
Supported OS tags: Windows10, Windows10RT, Windows11, WindowsServer2016
When flushing modified file data from memory, NTFS chooses to use one or more threads based on how many files are currently open. This setting gives control over how many threads will be used. Making this value larger may decrease the time it takes to flush a volume but the flush may have a larger impact on other concurrent IO operations. Values with special meaning: 0: Use the system calculated default 1: Disable parallel flush The default value and limit for this setting varies based on the number of available processors on a given system: - Default value calculation is: (([NumProcessors]/2) + 1) - Default max value calculation is: ([NumProcessors]*2)
Registry values
How enabled and disabled states update the registry.
No explicit registry values are set for enabled or disabled states.
Policy elements
Inputs and configuration options exposed by this policy.
| Scope | Element | Type | Registry mapping | Constraints & behavior | Copy |
|---|---|---|---|---|---|
| Computer | Open File Threshold: ID NtfsParallelFlushWorkersID | decimal | Path System\CurrentControlSet\Policies Value name NtfsParallelFlushWorkers Type REG_DWORD | Range: 0 to 1024 |