No location on ZFS pools can be shared via NFS on Windows Server (2022)

[besterino]

ZFS version: zfswin-2.3.1rc14
zfs-kmod-zfswin-2.3.1rc14
Windows Server 2022(21H2 (OS Build 20348.4529)
ZFS pool mounted as D:

It is not possible to create an NFS share on any location on a ZFS pool.

In the GUI the ZFS pool does not even appear, manually entering d: or d:\dataset or d:\dataset\folder returns error "The entered path is not valid for the selected server. Please enter a new path or select a different server."

Via powershell the error reads:

PS C:\Users\Administrator> new-nfsshare -Name "NFSshare" -Path "D:\dataset\test" -permission readwrite
new-nfsshare : Failed to perform the requested operation.
At line:1 char:1
+ new-nfsshare -Name "nextcloud" -Path "D:\nextcloud\test" -permission  ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (MSFT_NfsServerTasks:root/Microsoft/..._NfsServerTasks) [New-NfsShare], CimException
    + FullyQualifiedErrorId : HRESULT 0x80070032,New-NfsShare

[lundman]

interesting, checking

[lundman]

OK so you are not allowed to share NFS from a reparsepoint, but you can from a driveletter. So in your test above, using just
"D:" should work, but the lower dataset will not work. You can assign it to a driveletter though.

> new-nfsshare -Name "NFSshare" -Path "E:\" -permission readwrite

Name     Availability             Path
----     ------------             ----
NFSshare Standard (not clustered) E:\

> new-nfsshare -Name "NFSshareLower" -Path "E:\lower" -permission readwrite

new-nfsshare : Failed to perform the requested operation.
At line:1 char:1
+ new-nfsshare -Name "NFSshareLower" -Path "E:\lower" -permission readw ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (MSFT_NfsServerTasks:root/Microsoft/..._NfsServerTasks) [New-NfsShare]
   , CimException
    + FullyQualifiedErrorId : HRESULT 0x80070032,New-NfsShare


>  .\zfs.exe get driveletter
NAME        PROPERTY     VALUE        SOURCE
BOOM        driveletter  -            default
BOOM/lower  driveletter  -            default


> .\zfs.exe set driveletter=X BOOM/lower
zunmount(BOOM/lower,E:/lower/) running
zunmount(BOOM/lower,E:/lower/) returns 0
sending mountpoint: '\??\x:'

> .\zfs.exe mount
BOOM                            E:/
BOOM/lower                      X:/

> new-nfsshare -Name "NFSshareLower" -Path "X:\" -permission readwrite

Name          Availability             Path
----          ------------             ----
NFSshareLower Standard (not clustered) X:\

[besterino]

Yep that works! Thanks!

Do you intend to "fix" it so that you can share beyond/below driveletters?

[lundman]

It sounds like it is a requirement of NFS on Windows that it will not do mountpoint/reparsepoints. Unless you can show that works with ntfs? As in, mount a ntfs inside another ntfs and try to share it.

I will see if we can make the driveletters to show in the GUI though. Might be able to fix that.

[besterino]

Ok, I created a VHDX, mounted it in a folder\subfolder on C:\ and tried to create a NFS share. This also fails in powershell with the same error message, so apparently not a ZFS issue.

PS C:\Users\Administrator> New-NfsShare -name "NFStestNTFS" -path "C:\tools\NFS_test" -permission readwrite
New-NfsShare : Failed to perform the requested operation.
At line:1 char:1
+ New-NfsShare -name "NFStestNTFS" -path "C:\tools\NFS_test" -permissio ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (MSFT_NfsServerTasks:root/Microsoft/..._NfsServerTasks) [New-NfsShare], CimException
    + FullyQualifiedErrorId : HRESULT 0x80070032,New-NfsShare

If it is mounted with a drive letter I CAN create a NFS share on the VHDX (with powershell).