The purpose of this script is to monitor disk space on a list of servers. Right now, it uses a hard-coded 20% as the point at which to send the email (look for variable $thresholdspace in the code below). An enhancement could be to have different percents on each server. The script reads a file that has a list of servers to be monitored; it will check each disk on each of those servers.

BizTalk and other server level products can come to a screeching halt if there is not enough disk space on the servers.

#########################################################
#
# Disk space monitoring and reporting script
# Neal Walters - 06/18/2013 - found original code on web 
#                             then customized 
#
#########################################################
 
[string[]] $users = "test@abc.com","test2@abc.com","admin@xyz.com" # List of users to email your report to (separate by comma) or use a distribution list 
$fromemail = "FromEmail@abc.com"
$server = "your.emailRelayServer.com" #enter your own SMTP or Relay server DNS name / IP address here

$list = $args[0] #This accepts the argument you add to your scheduled task for the list of servers. i.e. list.txt
$computers = get-content $list #grab the names of the servers/computers to check from the list.txt file.
# Set free disk space threshold below in percent (default at 10%)
[decimal]$thresholdspace = 20
 
#assemble together all of the free disk space data from the list of servers and only include it if the percentage free is below the threshold we set above.
$tableFragment= Get-WMIObject  -ComputerName $computers Win32_LogicalDisk `
| select __SERVER, DriveType, VolumeName, Name, @{n='Size (Gb)' ;e={"{0:n2}" -f ($_.size/1gb)}},@{n='FreeSpace (Gb)';e={"{0:n2}" -f ($_.freespace/1gb)}}, @{n='PercentFree';e={"{0:n2}" -f ($_.freespace/$_.size*100)}} `
| Where-Object {$_.DriveType -eq 3 -and [decimal]$_.PercentFree -lt [decimal]$thresholdspace} `
| ConvertTo-HTML -fragment
 
# assemble the HTML for our body of the email report.
$HTMLmessage = @"
<font color=""black"" face=""Arial, Verdana"" size=""3"">
<u><b>Disk Space Storage Report</b></u>
<br>This report was generated because the drive(s) listed below have less than $thresholdspace % free space. Drives above this threshold will not be listed.
<br>
<style type=""text/css"">body{font: .8em ""Lucida Grande"", Tahoma, Arial, Helvetica, sans-serif;}
ol{margin:0;padding: 0 1.5em;}
table{color:#FFF;background:#C00;border-collapse:collapse;width:647px;border:5px solid #900;}
thead{}
thead th{padding:1em 1em .5em;border-bottom:1px dotted #FFF;font-size:120%;text-align:left;}
thead tr{}
td{padding:.5em 1em;}
tfoot{}
tfoot td{padding-bottom:1.5em;}
tfoot tr{}
#middle{background-color:#900;}
</style>
<body BGCOLOR=""white"">
$tableFragment
</body>
"@
 
# Set up a regex search and match to look for any <td> tags in our body. These would only be present if the script above found disks below the threshold of free space.
# We use this regex matching method to determine whether or not we should send the email and report.
$regexsubject = $HTMLmessage
$regex = [regex] '(?im)<td>'
 
# if there was any row at all, send the email
if ($regex.IsMatch($regexsubject)) {
                        send-mailmessage -from $fromemail -to $users -subject "Disk Space Monitoring Report" -BodyAsHTML -body $HTMLmessage -priority High -smtpServer $server
						Write-Host "Email sent" 
}
 
# End of Script

Then create a wrapper .bat or .cmd file like this:

powershell -command "& 'I:\Scripts\DiskMonitor.ps1'" DiskMonitorComputerList.txt

Then you create a file called DiskMonitorComputerList.txt that contains a list of servers:

ServerName1
ServerName2
MachineName3

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