Unable to enable user disks on rVHDShare.?Could not create template VHD.? Error Message: The network location "\\woshub.com\namespace\UserProfileDisk" is not available.

$UserProfiles = @()
$fc = new-object -com scripting.filesystemobject
$folder = $fc.getfolder($UPDShare)
"Username,SiD" >> export.csv
foreach ($i in $folder.files)
{
$sid = $i.Name
$sid = $sid.Substring(5,$sid.Length-10)
if ($sid -ne "template")
{
$securityidentifier = new-object security.principal.securityidentifier $sid
$user = ( $securityidentifier.translate( [security.principal.ntaccount] ) )
$UserProfile = New-Object PSObject -Property @{
UserName = $user
UPDFile=$i.Name
}
$UserProfiles += $UserProfile
}
}
$UserProfiles| select UserName, UPDFile

Since the UPD profile is a regular virtual disk file in VHDX format, you can mount it and view its contents from any Windows host. Right-click the file and select Mount.

As you can see, the VHDX disk contains a set of folders and files of a standard user profile.

On the RD Session Host, the user profile in the VHDX file is mounted to the C:\users\<username> and looks like this:

The UPD profile is mounted in exclusive mode. This means that if a user profile is currently connected to the user’s RDS session or manually mounted, you will not be able to open it with an error: The file couldn’t be mounted because it’s in use.

Data is written to the VHDX file in real time. This means that when data is copied to a user profile on an RDS server, the size of the vhdx file on the shared storage is increased immediately.

If the user profile folder already exists in Windows, the folder with an old profile is renamed to the <username>-BACKUP-<number>.

A VHDX disk is mounted when a user logs on to a VDI or RDS host. Each UPD profile is mounted to the C:\Users directory. The list of mounted VHDX disks and mount points of the user profiles appears in Disk Management.

How to Expand/Reduce User Profile Disk with PowerShell?

You can expand or shrink a virtual VHDX disk image with a specific user’s UPD profile using the Resize-VirtualDisk PowerShell cmdlet from the Hyper-V module (Hyper-V management tools must be installed on a computer: Enable-WindowsOptionalFeature -Online –FeatureName Microsoft-Hyper-V-Management-Clients):

Net use U: \\fs01\RDSProfiles
Resize-VHD -Path u:\UVHD-<SID>.vhdx -SizeBytes 40GB
Net use U: /delete

Now you need to increase the volume size from the Disk Management console GUI (Action -> Attach VHD -> Extend volume).

Or use the following PowerShell script to automatically extend the VHDX file to the maximum available size:

<#
.Synopsis
This script extend size of VHDX file and resize the disk partition to Max
#>
Param(
[Parameter(Mandatory=$true,ValueFromPipeline=$true)]
[alias("Path")]
[string]$vhdxFile,
[Parameter(Mandatory=$true,ValueFromPipeline=$true)]
[alias("Size")]
[int64]$vhdxNewSize
)
begin{
try {
Mount-VHD -Path $vhdxFile -ErrorAction Stop
}
catch {
Write-Error "File $vhdxFile is busy"
Break
}
$vhdx = Get-VHD -Path $vhdxFile
if ($vhdx.Size -ge $vhdxNewSize){
Write-Warning "File $vhdxFile already have this size!"
$vhdx | Dismount-VHD
Break
}
}
process{
Dismount-VHD -Path $vhdxFile
Resize-VHD -Path $vhdxFile -SizeBytes $vhdxNewSize
$vhdxxpart = Mount-VHD -Path $vhdxFile -NoDriveLetter -Passthru | Get-Disk | Get-Partition
$partsize = $vhdxxpart | Get-PartitionSupportedSize
$vhdxxpart | Resize-Partition -Size $partsize.SizeMax
}
end{
Dismount-VHD -Path $vhdxFile
}

Note that you can’t expand the UPD disk of a user with an active RDS session.

To reduce the size of the UPD file (assuming that you deleted the user’s data inside the vhdx file and the data size on the disk is less than the size assigned to it), you can use the commands:

Resize-VHD \\fs01\RDSProfiles\UVHD-<SID>.vhdx –ToMinimumSize

And then optimize the allocation of space in the file:

Optimize-vhd -path \\fs01\RDSProfiles\UVHD-<SID>.vhdx -mode full

Temporary Profile Issue When Using User Profile Disks on RDS

Temporary user profiles are one of the most common problems you may encounter when using roaming profiles or user profile disks on RDS:

We can’t sign in to your account.
You’ve have been signed in with a temporary profile.
You can’t access your files, and files created in this profile will be deleted when you sign out. To fix this, sigh out and try signing later.

A temporary profile is created for the user in this case:
Event ID 1511
Source: User Profile Service

A temporary profile is created for the user because Windows cannot find the local profile. Changes you make to this profile will be lost when you log off.

Most often, this is because the user’s VHDX file was not closed in the previous session. Use the following PowerShell to locate the RDSH host on which the user’s VHDX drive is mounted (run the script on the host with the RD Connection Broker role):

$UserToFind = "a.smith"
$User = $env:USERDOMAIN + '\' + $UserToFind
$RDCollection = Get-RDSessionCollection | where {$_.ResourceType -eq 'Remote Desktop'}
$RDHosts = Get-RDSessionHost -CollectionName $RDCollection.CollectionName | select SessionHost
$Array = Invoke-Command -ComputerName $RDHosts.SessionHost -ScriptBlock { Get-Disk | select Location,DiskNumber | where {$_.Location -notmatch "Integrated"} }
foreach ($VHD in $Array){
$DiskID = (Get-Item $VHD.Location).Name.Substring(5).Split(".")[0]
$objSID = New-Object System.Security.Principal.SecurityIdentifier ($DiskID)
$objUser = $objSID.Translate( [System.Security.Principal.NTAccount])
if ($objUser.Value -eq $User){
$result = "$($objUser.Value) disk number $($VHD.DiskNumber) on $($VHD.PSComputername)"
}else{
$result = "$($User) - no active RSH sessions were found."
}
}
$result

You can unmount the UPD virtual drive remotely with the command:

Invoke-Command -ComputerName $VHD.PSComputername -ScriptBlock { Dismount-VHD -DiskNumber $VHD.DiskNumber }

To reduce problems with temporary profiles on RDS, it is a good idea to configure timeouts for RDS user sessions. Set idle/disconnected sessions to terminate after 2 to 4 hours. You can also enable the GPO setting that prevents creating temporary profiles: Computer Configuration -> Administrative Templates -> System -> User profiles, enable the option Do not log users on with temporary profiles.

The administrator must manually delete the temporary user profile on the RDS host after releasing the VHDX disk:

• Delete the subkeys with the user SID under the following registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList. In this example, there are two subkeys, one of which ends with .bak (delete them both);
• Remove the user’s TEMP profile folder from the C:\Users directory.
  See the article at the link for more information about deleting user profiles in Windows.

So, we have looked at how to configure User Profile Disks in RDS/VDI environment on a Windows Server. Configuring UPDs is much easier than configuring roaming profiles or redirected folders. User Profile Disks are bound to an RDS collection and cannot be corrupted when a user profile is shared between multiple terminal servers (unlike standard user profile folders). The User Profile Disks can be stored on SMB shares, CSV, SOFS, SAN, or local disks.