FSTrim

NTFSD
1

Do we have FSTrim equivalent in Windows ? or a way to enforce it ?
I am working on driver for PCIe based SSD for windows server 2K12 R2.

Thanks

2

Trim is sent by the file system as blocks are deleted. A big Trim is also sent by the format utility after you newly format a volume.

I’m not aware of any way to do this. The Windows abstraction is specifically prohibited from user mode.

https://msdn.microsoft.com/en-us/library/windows/desktop/ee907416(v=vs.85).aspx

-scott
OSR
@OSRDrivers

3

Thanks Scott

4

You can force TRIM by using IOCTL_ATA_PASS_THROUGH_DIRECT :

https://www.osronline.com/showthread.cfm?link=242343
http://stackoverflow.com/questions/5070987/sending-ata-commands-directly-to-device-in-windows

Arshak

5

Oh, and it’s not a direct substitute for FStrim, as it will just unmap all blocks that you specify in your call, no matter if they are used by the file system or not.

Arshak

6

From the command line you can query TRIM on delete with:

c:\>fsutil behavior query DisableDeleteNotify

Zero indicates TRIM on delete is enabled. One indicates that it is not.

To enable:

fsutil behavior set DisableDeleteNotify 0

To disable:

fsutil behavior set DisableDeleteNotify 1

On Sat, Apr 30, 2016 at 1:05 PM wrote:

> Oh, and it’s not a direct substitute for FStrim, as it will just unmap all
> blocks that you specify in your call, no matter if they are used by the
> file system or not.
>
> Arshak
>
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