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How can I monitor Distributed File System Replication (DFS-R)?

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Is it possible to monitor Distributed File System Replication (DFS-R) with PRTG? How can I achieve this?

dfs dfs-r microsoft prtg replication script windows

Created on Apr 11, 2013 12:09:47 PM by  Konstantin Wolff [Paessler Support]

Last change on Apr 12, 2013 9:21:41 AM by  Gerald Schoch [Paessler Support]



15 Replies

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Monitoring Distributed File System Replication (DFS-R)

Just thought I'd share a small and simple VBScript that you can use to monitor file replication using Windows DFS-R. This VBScript will write a small text file on one server of the DFS namespace and then monitor another server/path location for that same file to appear. You specify the paths using the parameters in PRTG.

  • It will keep checking for the replicated file every second for 60 seconds.
  • It will report the number of seconds it took to replicate back to PRTG.
  • It will report if the replicated file was found or not. The number of seconds before timeout is configurable.

The script measures replication in only one direction, but you can create two sensors using this same script. Reverse the paths in the PRTG parameters field of the sensor settings so that each sensor measures replication in the opposite direction.

Prerequisites

Open a text editor and copy the Test-DFS-R.vbs script (see below) into it. Save it with this name and place the file in the \Custom Sensors\EXE subfolder of your PRTG installation (see this article how to find PRTG folders).

Change the PRTG Probe Service so that it runs using an account that has permissions to the root administrative drive shares of the servers where you need to measure replication. For example, the account will need to have permission to

  • ServerName1\C$ and
  • ServerName2\C$.

Replace C$ with the administrative share of the drive that contains the replicated folder.

Sensor Settings

Following the PRTG settings are listed for the EXE/Script Sensor:

  • EXE/Script: Select Test-DFS-R.vbs from the list.
  • Parameters: "server1\AdminShare\folder" "server2\AdminShare\folder"
    The parameters define the folder paths to the two servers you want to check separated by a space. Enclose each path in quotes. You cannot use the DFS namespace path here. Use only the path from the administrative share of the hard drive that it is on. Example: ServerName\D$\Users
  • Security Context: Use security context of probe service.
  • Timeout (Sec.): Use 90 or more depending on the timeout value in the script.
  • Channel Name: Enter a name for the channel, for example, Replication Time.
  • Unit String: The unit of the returning values is seconds.
  • Scanning Interval: Use 5 minutes or longer. Do not use 60 seconds as this is too short.

Script

See below for the Test-DFS-R.vbs script:

Set ArgObj = wscript.Arguments
strDFSPath1 = ArgObj(0)
strDFSPath2 = ArgObj(1)
 
i = 0
' Modify the value for intSecondsToWait for the timeout value of this script
intSecondsToWait = 60

' Build strings for testing the DFS paths
strTime = Cstr(Timer) 'Convert number of seconds since midnight to string
strPath1 = strDFSPath1 & "\TestDFS-R-" & strTime & ".txt"
strPath2 = strDFSPath2 & "\TestDFS-R-" & strTime & ".txt"
Set objFSO = CreateObject("Scripting.FileSystemObject")
 
' Check if both paths exist
If objFSO.FolderExists(strDFSPath1) Then
    ' MsgBox "The path exists!"
Else
    WScript.Echo "Path one doesn't exist or no permission to access this path!"
    WScript.Quit(1)
End If
If objFSO.FolderExists(strDFSPath2) Then
    ' MsgBox "The path exists!"
Else
    WScript.Echo "Path two doesn't exist!"
    WScript.Quit(1)
End If
Set objTextFile = objFSO.CreateTextFile(strPath1, True)
 
' Write a date and time stamp to the test file.
strText = Date & Time
objTextFile.Write ("This file is safe to delete.  Timestamp: " & strText)
objTextFile.Close

' Check if file exists in the second path every second for 60 seconds, then clean up.
For i = 1 To intSecondsToWait
    If objFSO.FileExists(strPath2) Then
        WScript.Echo i & ":OK"
        objFSO.DeleteFile(strPath1)
            WScript.Quit(0)
    End If
    WScript.Sleep 1000
Next
 
' WScript.Echo "Replication failed.  The test file does not exist in both paths."
objFSO.DeleteFile(strPath1)
WScript.Echo "DFS DOWN!"
WScript.Quit(1)

Created on Apr 11, 2013 7:31:21 PM by  Nick Russo (90) 1 1

Last change on Apr 12, 2013 11:09:07 AM by  Gerald Schoch [Paessler Support]



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Cheers Nick, this is exactly what I need to do. But I can't get it to work ... message is "Path one doesn't exist or no permission to access this path".

Probe account is a Domain Admin (for testing), and has full permissions to the paths. Parameters are entered as "filesrv01\f$\Work\DVC" "filesrv02\f$\Work\DVC". Source and destination folders are accessible from the probe PC using the parameter as a UNC path ...
filesrv01\f$\Work\DVC and
filesrv02\f$\Work\DVC.

Any ideas where I'm going wrong?

Created on May 9, 2013 7:23:06 AM by  paulheb (0) 1



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Thanks Nick, after some trial and error I worked out that the parameters have to be UNC paths, so using "
filesrv01\F$\Work\DRC" "
filesrv02\F$\Work\DRC" works fine.

Many thanks for this great script.

Created on May 9, 2013 8:02:21 AM by  paulheb (0) 1



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What exactly was the parameter string that you passed in to get it to work? I've tried "server01\m$\folder" "server02\m$\folder" and seemingly every combination that I can think of and it's still not working in PRTG. It works just fine from the command line with the PRTG account. Any help would be greatly appreciated!

Created on Apr 7, 2014 5:43:02 PM by  jpminard (0)



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Try "
server01\m$\folder" "
server02\m$\folder" with Windows Credentionals

Created on May 9, 2014 7:24:03 AM by  PhelanKell (0)



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Question? what would be the path VBScript writes the text file too?

Created on Jul 11, 2014 3:38:22 PM by  atorres574 (0)



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Hi, big thanks for this script.

It is so easy and simple. Works on W2K8R2 and With W2K12R2 DFS Systems.

Created on Aug 6, 2014 10:27:59 AM by  Eugen Vieten (0) 2



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I'm getting an error: "Response not wellformed: "(C:\Program Files (x86)\PRTG Network Monitor\custom sensors\EXE\Test-DFS-R.vbs(2, 1) Microsoft VBScript runtime error: Subscript out of range )" (code: PE132)"

Has anyone seen this before?

Created on Jun 3, 2015 1:20:18 PM by  donaldkbart (0) 1



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I'm getting the Error: "Response not wellformed: "(Path one doesn't exist or no permission to access this path! )" (Code: PE132)

Can anybody help?

did you wrote the Parameters in the Parameter field of that Test or in the Script? I tried some combinations but not any work :(

Created on Jul 7, 2015 1:04:24 PM by  SRV2015 (0)



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I was getting "Response not wellformed: "(Path one doesn't exist or no permission to access this path! )" (Code: PE132)

I entered in the UNC Path like this "
servername\share" and it works perfectly. Needed the double backslash.

Created on Jul 9, 2015 1:42:17 PM by  BThresher183 (10)



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Thanks a million for this! It's working very well except it's not always deleting the text file from the folder. So I still kind of have to manually monitor the replicated folder in case things get out of hand.

Created on Aug 5, 2015 1:40:01 PM by  bswientoniowski (0)



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I have just come here to say, that this website isnt showing the blackslash

so you need to have \ \server\path\etc

Created on Sep 7, 2015 3:45:49 AM by  mrmattd (0)



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Awesome script, thanks for sharing. Once I'd figured out the PRTG website is hiding the double slashes on the UNC path :-)

This is working for me, but it's always reporting 6 seconds (5.1 - 5.2secs execution time) although I can see by monitoring the DFS folders that replication is much quicker than this - less than a second to replicate then a few seconds before the files are deleted. The delete also replicates almost instantly.

There seems to be a delay between the replication occurring and the script recognising this and deleting the file.

Has anyone else come across this?

Tim

Edit - having let these sensors run over the weekend, sometimes I see spikes of 11 seconds, it's usually 6 seconds, so it seems to be reporting in blocks of 5 seconds + 1. Looking at the script I can't see why it would be doing this.

Created on Oct 16, 2015 4:20:24 PM by  Tim Boothby (80) 2

Last change on Oct 19, 2015 3:18:51 PM by  Torsten Lindner [Paessler Support]



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@Tim: I'm afraid we have not seen such behaviour ourselves, so I'm afraid we have to wait if possibly on of the other users reports back.

Created on Oct 20, 2015 12:55:12 PM by  Konstantin Wolff [Paessler Support]



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Confirming the comments section here are stripping the leading "backslash-backslash" from the UNC paths mentioned here, just make sure your parameters are well formed UNC paths and you should be fine.

@Tim Boothby, I had the exact same experience and what I think is happening here is a function of the time it's taking PRTG to actually execute the script. I ran the same sensor on a fresh, relatively unused probe server and I am getting a consistent 1s replication time on that probe for the exact same servers. I think a busy Probe server just artificially extends the time it takes to execute. Not really a problem, as I'm only wanting to know if there's a true problem with DFS-R, but I would like to know why it seems to take PRTG an excessively long time to run basic scripts which normally take a few seconds.

I even re-wrote the original poster's script using powershell to see if there was a notable difference and it still takes 5-6 seconds even though DFS-R is basically handling things nearly instantly. Please note, if you use this, it's formatted to return data via an 'EXE/Custom Script Advanced' sensor.

#Parameters should be two UNC paths to DFS servers replicated directories: "\\SERVERNAME01\D$\DFS_ShareName" "\\SERVERNAME02\D$\DFS_ShareName"
PARAM ($PATH1, $PATH2)

#establish constants, modify as necissary
$secondstotimeout = 90 #Seconds to wait for replication before giving up (can be longer than error threshold)
$secondstoerror = 60 #Seconds to wait before setting sensor to error
$secondstowarn = 45 #Seconds to wait before setting sensor to warning

#Create unique timestamped filename
$UnixSeconds =  (Get-Date -UFormat "%s").ToString().Split('.')[0]

#Establish UNC paths to the test files
$FileName01 = $PATH1 + "\DFSR-TEST-$UnixSeconds.txt"
$FileName02 = $PATH2 + "\DFSR-TEST-$UnixSeconds.txt"

#Create Test File
New-Item $FileName01 -type file

#Start the test provided we confirm both UNC paths exist first
If ((Test-Path $PATH1) -and (Test-Path $PATH2))
	{
		$ErrorState = 0
		#Append a text string to the source text file
		Add-Content $FileName01 ("This file is safe to detlete. TimeStamp: " + (Get-Date))
		
		#Check for changes made to source text file to appear in destination text file
		For ($i=1; $i -le $secondstotimeout; $i++)
			{
				If((Get-Content $FileName01 -ErrorAction SilentlyContinue) -eq (Get-Content $FileName02 -ErrorAction SilentlyContinue)){break}
				Else {Start-Sleep -s 1}
			}
	}
Else {$ErrorState = 1}

#If $SecondsToTimeout expired we want to note that as a sensor failure, not a limit excess.
If ($i -ge $secondstotimeout){$ErrorState =1}

#Format results into PRTG Friendly XML Return
$s = @"
<prtg>
	<Error>$ErrorState</Error>
	<result>
		<channel>Replication Time</channel>
		<unit>TimeSeconds</unit>
		<mode>Absolute</mode>
		<showChart>1</showChart>
		<showTable>1</showTable>
		<float>0</float>
		<LimitMaxWarning>$SecondsToWarn</LimitMaxWarning>
		<LimitMaxError>$secondstoerror</LimitMaxError>
		<LimitMode>1</LimitMode>
		<LimitWarningMsg>Replication Time in Excess of Warning Threshold!</LimitWarningMsg>
		<LimitErrorMsg>Replication Time Exceeds Error Limit!</LimitErrorMsg>
		<value>$i</value>
	</result>
</prtg>
"@;

#clean up after ourselves by removing text file from source
Remove-Item -path $FileName01

#return final result XML to PRTG Probe Sensor
$s;

Created on Apr 1, 2016 1:31:32 PM by  amikolajczyk (109) 2



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Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.