I want to create a folder in the shared top directory of FSx using SSM's PowerShell command.

Hello! FSx provides you with a Powershell management endpoint to perform commands. Please take a look at the following documentation which explains how to connect to the FSx Powershell management endpoint which you can use to run commands. Please make sure you are using the FSx powershell endpoint name instead of the regular FSx name. If you are already using the FSx powershell endpoint name as shown in the documentation screenshots, please let us know.

https://docs.aws.amazon.com/fsx/latest/WindowsGuide/remote-pwrshell.html#using-rps

Hello!

From the context of an SSM run command, New-Item without credentials will be unauthenticated. That being said, New-Item does support -Credential as a parameter, please try your command again with credentials.

$path = FSx network drive path
New-Item -Path "$path\D$\folder-name" -ItemType directory -Credential $domainCredential

At this time, the FSx PowerShell management endpoint does not support New-Item as a powershell command. For a list of supported commands, please consider invoking a remote session and using Get-Command.

References:

• Powershell 5.1 New-Item: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.management/new-item?view=powershell-5.1