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VBScript WMI old Values get reused

David
David asked
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Last Modified: 2014-05-22
Dear All,

I am using a script to monitor our 2003 Server Disk Space and just stumbled over a bug.
I am pulling the Disk Space of each logical Drive via WMI which has been working fine, the issue is that if for what ever reason WMI dos not get a value, it reuses the previous received value.

For Example I have:
Server A:
Disk C 500GB and 200 free
Disk E 200GB and 50 free

Server B:
Is powered off

Server C:
Disk C 300GB and 200 free
Disk E 100GB and 50 free


My Result would be:
Server A:
Disk C 500GB and 200 free
Disk E 200GB and 50 free

Server B:
Disk C 500GB and 200 free (Value from Server A)
Disk E 200GB and 50 free (Value from Server A)

Server C:
Disk C 300GB and 200 free
Disk E 100GB and 50 free

How can I prevent theWMI object to use the old Values?
 
My code looks like this:

On Error Resume Next 
Const ForAppending = 2 
Const HARD_DISK = 3 
Const ForReading = 1 
 
'Declaring the variables 
Set objFSO = CreateObject("Scripting.FileSystemObject") 
Set SrvList = objFSO.OpenTextFile("Server_List.txt", ForReading) 
Set ReportFile = objFSO.OpenTextFile ("D:\WEB\DiskSpace.html", ForAppending, True) 
i = 0 
 
'Initializing the HTML Tags for better formatting 
ReportFile.writeline("<html>") 
ReportFile.writeline("<head>") 
ReportFile.writeline("<meta http-equiv='Content-Type' content='text/html; charset=iso-8859-1'>") 
ReportFile.writeline("<title>" & " Servers Disk Space Report "& Date & " , " & Time &"</title>") 
ReportFile.writeline("<style type='text/css'>") 
ReportFile.writeline("<!--") 
ReportFile.writeline("td {") 
ReportFile.writeline("font-family: Tahoma;") 
ReportFile.writeline("font-size: 11px;") 
ReportFile.writeline("border-top: 1px solid #999999;") 
ReportFile.writeline("border-right: 1px solid #999999;") 
ReportFile.writeline("border-bottom: 1px solid #999999;") 
ReportFile.writeline("border-left: 1px solid #999999;") 
ReportFile.writeline("padding-top: 0px;") 
ReportFile.writeline("padding-right: 0px;") 
ReportFile.writeline("padding-bottom: 0px;") 
ReportFile.writeline("padding-left: 0px;") 
ReportFile.writeline("}") 
ReportFile.writeline("body {") 
ReportFile.writeline("margin-left: 5px;") 
ReportFile.writeline("margin-top: 5px;") 
ReportFile.writeline("margin-right: 0px;") 
ReportFile.writeline("margin-bottom: 10px;") 
ReportFile.writeline("") 
ReportFile.writeline("table {") 
ReportFile.writeline("border: thin solid #000000;") 
ReportFile.writeline("}") 
ReportFile.writeline("-->") 
ReportFile.writeline("</style>") 
ReportFile.writeline("</head>") 
ReportFile.writeline("<body>") 
 
ReportFile.writeline("<table width='50%'>") 
ReportFile.writeline("<tr bgcolor='#CCCCCC'>") 
ReportFile.writeline("<td colspan='7' height='25' align='center'>") 
ReportFile.writeline("<font face='tahoma' color='#003399' size='2'><strong>Disk Space Report  "& Date & " , " & Time &"</strong></font>") 
ReportFile.writeline("</td>") 
ReportFile.writeline("</tr>") 
ReportFile.writeline("</table>") 
 
 
'Declaring the Server Name for report generation 
Do Until SrvList.AtEndOfStream 
    StrComputer = SrvList.Readline 
 
    ReportFile.writeline("<table width='50%'><tbody>") 
    ReportFile.writeline("<tr bgcolor='#CCCCCC'>") 
    ReportFile.writeline("<td width='50%' align='center' colSpan=6><font face='tahoma' color='#003399' size='2'><strong>" & StrComputer & "</strong></font></td>") 
    ReportFile.writeline("</tr>") 
 
 
    Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2") 
    Set colDisks = objWMIService.ExecQuery("Select * from Win32_LogicalDisk Where DriveType = " & HARD_DISK & "") 
 
    ReportFile.writeline("<tr bgcolor=#CCCCCC>") 
        ReportFile.writeline("<td width='05%' align='center'>Drive / Mount</td>") 
        ReportFile.writeline("<td width='05%' align='center'>Total Capacity (in GB)</td>") 
        ReportFile.writeline("<td width='05%' align='center'>Used Capacity (in GB)</td>") 
        ReportFile.writeline("<td width='05%' align='center'>Free Space (in GB)</td>") 
        ReportFile.writeline("<td width='05%' align='center'>Freespace %</td>") 
    ReportFile.writeline("</tr>") 
 
        'Starting the loop to gather values from all Hard Drives 
        For Each objDisk in colDisks 
 
            'Delcaring the Variables


            TotSpace=Round(((objDisk.Size)/1073741824),2) 
            FrSpace=Round(objDisk.FreeSpace/1073741824,2) 
            FrPercent=Round((FrSpace / TotSpace)*100,0) 
            UsSpace=Round((TotSpace - FrSpace),2) 
            Drv=objDisk.DeviceID 
            VolName=objDisk.DeviceID 
 
            'Lnt=Len(VolName) 
 
            'If  Len(VolName) =  3 then 
                If FrPercent > 20 Then 
                    ReportFile.WriteLine "<tr><td align=center>" & Drv & "</td><td align=center>" & TotSpace & "</td><td align=center>" & UsSpace & "</td><td align=center>" & FrSpace & "</td><td BGCOLOR='#00FF00' align=center>" & FrPercent & "%" &"</td></tr>" 
                ElseIf FrPercent < 10 Then 
                    ReportFile.WriteLine "<tr><td align=center>" & Drv & "</td><td align=center>" & TotSpace & "</td><td align=center>" & UsSpace & "</td><td align=center>" & FrSpace & "</td><td bgcolor='#FF0000' align=center>" & FrPercent & "%" &"</td></tr>" 
                Else 
                    ReportFile.WriteLine "<tr><td align=center>" & Drv & "</td><td align=center>" & TotSpace & "</td><td align=center>" & UsSpace & "</td><td align=center>" & FrSpace & "</td><td bgcolor='#FBB917' align=center>" & FrPercent & "%" &"</td></tr>" 
                End If 
            'Else 
            'End If 
        Next 
 
    ReportFile.writeline("<tr>") 
    ReportFile.writeline("<td width='50%' colSpan=6>&nbsp;</td>") 
    ReportFile.writeline("</tr>") 
 
    ReportFile.writeline("</tbody></table>") 
Loop 
ReportFile.WriteLine "</body></html>"

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DavidSystems Engineer

Author

Commented:
Thanks MacroShadow! and that solves the issue but brings me to another, I have the same problem with logical drives,
Say server X has

Drive C with 90GB
Drive E with 180Gb
Drive F with 70GB

Every now end then I get results like:

Drive C with 90GB
Drive E with 90GB
Drive F with 70GB

I am almost sure that this is do to the WMI querry on Drive E Failing for what ever reason and the Script just reuses the value it received before on the C Drive.

I tried emptying my Variables  like:
      TotSpace=""
      FrSpace=""
      FrPercent=""
      UsSpace=""
      Drv=""
      VolName=""

Before assigning values but it had no impact.
DavidSystems Engineer

Author

Commented:
I think I got it, probably not the most elegant way but I think this will do.
 See additions in Line 66, 67, 82, 87 

On Error Resume Next 
Const ForAppending = 2 
Const HARD_DISK = 3 
Const ForReading = 1 
 
'Declaring the variables 
Set objFSO = CreateObject("Scripting.FileSystemObject") 
Set SrvList = objFSO.OpenTextFile("Server_List.txt", ForReading) 
Set ReportFile = objFSO.OpenTextFile ("D:\WEBsites\ServerMonitoringSite\DiskSpace.html", ForAppending, True) 
i = 0 
 
'Initializing the HTML Tags for better formatting 
ReportFile.writeline("<html>") 
ReportFile.writeline("<head>") 
ReportFile.writeline("<meta http-equiv='Content-Type' content='text/html; charset=iso-8859-1'>") 
ReportFile.writeline("<title>" & "Disk Space Report "& Date & " , " & Time &"</title>") 
ReportFile.writeline("<style type='text/css'>") 
ReportFile.writeline("<!--") 
ReportFile.writeline("td {") 
ReportFile.writeline("font-family: Tahoma;") 
ReportFile.writeline("font-size: 11px;") 
ReportFile.writeline("border-top: 1px solid #999999;") 
ReportFile.writeline("border-right: 1px solid #999999;") 
ReportFile.writeline("border-bottom: 1px solid #999999;") 
ReportFile.writeline("border-left: 1px solid #999999;") 
ReportFile.writeline("padding-top: 0px;") 
ReportFile.writeline("padding-right: 0px;") 
ReportFile.writeline("padding-bottom: 0px;") 
ReportFile.writeline("padding-left: 0px;") 
ReportFile.writeline("}") 
ReportFile.writeline("body {") 
ReportFile.writeline("margin-left: 5px;") 
ReportFile.writeline("margin-top: 5px;") 
ReportFile.writeline("margin-right: 0px;") 
ReportFile.writeline("margin-bottom: 10px;") 
ReportFile.writeline("") 
ReportFile.writeline("table {") 
ReportFile.writeline("border: thin solid #000000;") 
ReportFile.writeline("}") 
ReportFile.writeline("-->") 
ReportFile.writeline("</style>") 
ReportFile.writeline("</head>") 
ReportFile.writeline("<body>") 
 
ReportFile.writeline("<table width='50%'>") 
ReportFile.writeline("<tr bgcolor='#CCCCCC'>") 
ReportFile.writeline("<td colspan='7' height='25' align='center'>") 
ReportFile.writeline("<font face='tahoma' color='#003399' size='2'><strong>Disk Space Report  "& Date & " , " & Time &"</strong></font>") 
ReportFile.writeline("</td>") 
ReportFile.writeline("</tr>") 
ReportFile.writeline("</table>") 
 
 
'Declaring the Server Name for report generation 
Do Until SrvList.AtEndOfStream 
    StrComputer = SrvList.Readline 
 
    ReportFile.writeline("<table width='50%'><tbody>") 
    ReportFile.writeline("<tr bgcolor='#CCCCCC'>") 
    ReportFile.writeline("<td width='50%' align='center' colSpan=6><font face='tahoma' color='#003399' size='2'><strong>" & StrComputer & "</strong></font></td>") 
    ReportFile.writeline("</tr>") 
 
    Set objWMIService = Nothing
    Set ColDisks = Nothing 

    Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2") 
    Set colDisks = objWMIService.ExecQuery("Select * from Win32_LogicalDisk Where DriveType = " & HARD_DISK & "")
    Set previousValue = objDisk
 
    ReportFile.writeline("<tr bgcolor=#CCCCCC>") 
        ReportFile.writeline("<td width='05%' align='center'>Drive / Mount</td>") 
        ReportFile.writeline("<td width='05%' align='center'>Total Capacity (in GB)</td>") 
        ReportFile.writeline("<td width='05%' align='center'>Used Capacity (in GB)</td>") 
        ReportFile.writeline("<td width='05%' align='center'>Free Space (in GB)</td>") 
        ReportFile.writeline("<td width='05%' align='center'>Freespace %</td>") 
    ReportFile.writeline("</tr>") 
 
	Set previousValue = objDisk

        'Starting the loop to gather values from all Hard Drives 
       
	For Each objDisk in colDisks 
		If Not previousValue = objDisk then
             
 		
	            'Delcaring the Variables


	            TotSpace=Round(((objDisk.Size)/1073741824),2) 
        	    FrSpace=Round(objDisk.FreeSpace/1073741824,2) 
           	 FrPercent=Round((FrSpace / TotSpace)*100,0) 
            	UsSpace=Round((TotSpace - FrSpace),2) 
           	 Drv=objDisk.DeviceID 
            	VolName=objDisk.DeviceID 
 
 	           'Lnt=Len(VolName) 
 
 	           'If  Len(VolName) =  3 then 
        	        If FrPercent > 20 Then 
                	    ReportFile.WriteLine "<tr><td align=center>" & Drv & "</td><td align=center>" & TotSpace & "</td><td align=center>" & UsSpace & "</td><td align=center>" & FrSpace & "</td><td BGCOLOR='#00FF00' align=center>" & FrPercent & "%" &"</td></tr>" 
            	    ElseIf FrPercent < 10 Then 
                	    ReportFile.WriteLine "<tr><td align=center>" & Drv & "</td><td align=center>" & TotSpace & "</td><td align=center>" & UsSpace & "</td><td align=center>" & FrSpace & "</td><td bgcolor='#FF0000' align=center>" & FrPercent & "%" &"</td></tr>" 
             	   Else 
                	    ReportFile.WriteLine "<tr><td align=center>" & Drv & "</td><td align=center>" & TotSpace & "</td><td align=center>" & UsSpace & "</td><td align=center>" & FrSpace & "</td><td bgcolor='#FBB917' align=center>" & FrPercent & "%" &"</td></tr>" 
   	             End If 
        	    'Else 
            	'End If
	End If 
        Next 
   
    Set objWMIService = Nothing
    Set ColDisks = Nothing 
    ReportFile.writeline("<tr>") 
    ReportFile.writeline("<td width='50%' colSpan=6>&nbsp;</td>") 
    ReportFile.writeline("</tr>") 
 
    ReportFile.writeline("</tbody></table>") 
Loop 
ReportFile.WriteLine "</body></html>"

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Joe Howard
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Commented:
Nice workaround, although I'm not sure why you encountered the problem in the first place.
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