Get disk space warnings through PowerShell

Credits Susan NYC

I use powershell scripts for disk free space monitoring on servers. Following are the task performed by the script:

• Clears the content of D:\lowdisk.txt.
• Adds required headers to D:\lowdisk.txt.
• Checks through all drives if free disk space is less than specified threshold.
• If a disk has free space less than threshold then adds info to D:\lowdisk.txt.
• Mails to users the contents of the  D:\lowdisk.txt if any disk is having free space less than threshold.

To know how to execute the PowerShell scripts go to Executing a PowerShell script.
Following is the code for the script. You can schedule it using windows scheduler.

#Modify the below threshold value as required. It represents the minimum percent of free disk space required.
$threshold = 10

#Add the recipients below. Example $To="user1@mail.com", "user2@mail.com", "user3@mail.com"
$To = "email@mail.com"

$smtpServer = "mail.server.com"
$Node = gc env:computername
$From = $Node +"@mail.com"

#No modification required below except if you want to change the location and name for D:\lowdisk.txt
$smtp = new-object Net.Mail.SmtpClient($smtpServer)
$disks=Get-WmiObject Win32_LogicalDisk | Where-Object {$_.DriveType -eq 3}
$i = 0
$drives = Get-WmiObject -ComputerName $Node Win32_LogicalDisk | Where-Object {$_.DriveType -eq 3}
Clear-Content "D:\lowdisk.txt"
echo "ServerName DriveLetter Threshold DriveSize FreeSpace PercentFree" >> "D:\lowdisk.txt"
echo "----------------------------------------------------------------------------------------------------------------" >> "D:\lowdisk.txt"
foreach($drive in $drives)
{
 $size = "{0:N2}" -f ($drive.size / 1GB)
 $free = "{0:N2}" -f ($drive.freespace / 1GB)
 $ID = $drive.DeviceID
 $Freepercent = "{0:N2}" -f ([int] $free / $size * 100)
 ### Determine if any disks low
 if ($Freepercent -lt $threshold)
 {
  echo "$Node $ID $threshold $size $free $Freepercent" >> "D:\lowdisk.txt"
  $i++
 }
}
if ($i -gt 0)
{
 $subject = "Disks having less free space on server " + $Node
 foreach ($line in Get-Content "D:\lowdisk.txt")
 {
  $body += "$line `n"
 }
 $smtp.Send($From, $To, $Subject, $body)
}