Microsoft Virtualization Discussions

Find CIFS session of named open file

Please tell me, how to find the CIFS session of an open file and how to terminate it.


Re: Find CIFS session of named open file

I don't see any Data ONTAP APIs that do what you seek.  Get-NaCifsSession can tell you about users and volumes being accessed, but not files.  And I don't see any API to terminate an individual session.  You might experiment with manipulating the CIFS share ACLs, but otherwise you would have to call Disable-NaCifs, which is admittedly rather drastic.

Re: Find CIFS session of named open file

You can do it from the Windows' "Computer Management" interface. Open it (compmgmt.msc) and connect to your filer/vfiler (by right-clicking the "Computer Management (Local)" in the first line of the left half of the screen -> connect to another computer). Down there you can find "Shared Folders" -> "Open Files". You can see there all the open files and sessions to your filer/vfiler and by right-clicking the specific open file you want to terminate, a terminate option will appear (don't remember the exact option, but it's there).

Hope it's helpful and what you asked for.

Re: Find CIFS session of named open file

Sure enough, that works.  Also means that it should be possible via WMI, which by extension means PowerShell. 


Re: Find CIFS session of named open file

ONTAP command

>cifs sessions *

shows all open files.

ONTAP command

>cifs terminate [workstation]

allows to terminate a single session.

Re: Find CIFS session of named open file

I had no luck finding a way to do close a file in .NET, WMI, ADSI or COM.

Do you know a way?

Re: Find CIFS session of named open file

I found this thread and found it helpful for 7-mode and wanted to update for cDOT:


You can use a combination of the following 2 commands to get the same information in cDOT at the CLI:

cifs session show -instance  (user info)

cifs session file show -instance   (open file info)


Use the connection ID field to link between the two outputs to establish the files a particular user has open.


To close a session or file you could then use:


cifs session close

cifs session file close


At least at 8.3+ you can also use the MMC to gather this information and close files/sessions if you have the appropriate permissions.


I am unsure about other methods like Powershell.

Re: Find CIFS session of named open file



I know it is a little late to send you this message but maybe someone else needs it.


I have a script that copy folders from a source UNC path to a destination and closes open sessions of exe files. This scripts if for 7-Mode filers but you can change it for your needs.


        This is a function to copy system files from a source folder to a target folder.

        It is used to copy files from a source folder to a target folder. If any .EXE file is in use it closes the session before copy operation.

    .PARAMETER Source
        Is an UNC source path for system's files (\\filer\share\folder\sub-subfolder\...).

    .PARAMETER Target
        Is an UNC target path for system's files (\\filer\share\folder\sub-subfolder\...).

        Copy-SystemFiles.ps1 -Source \\filer1\share1\folder\sub-folder\third-level-folder \\filer2\share2\folder
        Will copy every file in the souce folder to target folder closing every executable .EXE files before copy operation.




function Get-InternalPath {
        [Parameter(Mandatory = $true)]

    $PathArray = $Path.Split('\')
    $Filer = $PathArray[2]

    Connect-NaController -Name $Filer |Out-Null

    $MountPoint = (Get-NaCifsShare -Share $PathArray[3]).MountPoint
    $FullPath = "C:$MountPoint"
    for ($i = 4; $i -lt $PathArray.Length; $i++) {
        $FullPath += "\$($PathArray[$i])"
    return $($FullPath.Replace('/','\'))

    Get-ChildItem -Path $Source|ForEach-Object {
        if($FileName.EndsWith(".exe")) {
            $TargetFiler = $Target.Split("\")[2]

            cmd /c "openfiles /Disconnect /S $TargetFiler /A * /OP $(Get-InternalPath -Path $Target)" |Out-Null

        Copy-Item -Recurse -Force -Path $FileName -Destination $Target -Verbose
        $ErrorMessage = $_.Exception.Message
        $FailedItem = $_.Exception.ItemName
        Write-Output $FailedItem
        Write-Output $ErrorMessage

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