Monitoring disk drives

Hello all, being active to make up for some lost time last month.

The noise, the annoyance, what is happening now…
Disk drives tend to fill up fast, windows updates are taking more and more disk space and servers not getting rebooted won’t cleanup the winsxs folder.

I’ve written a simple function to monitor disk drives, run it with parameters to monitor multiple disks and monitor with your monitoring software, me, I prefer nagios.

I use exit codes for nagios which will give me the results for “OK”, “Warning” and “Critical”, which is the threshold you can define in this function

Function Monitor-Drives {
 param(
  [parameter(Mandatory=$true)]$Drives=("C"),
  $Warning="80",
  $Critical="90"
 )
 # If the Warning or Critical is not defined with %, we set the % ourselves
 if($Warning -notmatch "%") {
  $Warning = "$Warning%"
 }
 if($Critical -notmatch "%") {
  $Critical = "$Critical%"
 }
 
 # Run through defined drives
 Foreach ($Drive in $Drives) {
  $Volume = Get-Volume -DriveLetter $Drive # | select DriveLetter,@{N='Size GB';E={[Math]::Round($_.Size/1GB)}},@{N='Freespace GB';E={[Math]::Round($_.SizeRemaining/1GB)}},@{N='Freespace %';E={($_.SizeRemaining/$_.Size).ToString("P")}}
  $PercFree = ($Volume.SizeRemaining/$Volume.Size).ToString("P")
  # Set the status to OK
  if($PercFree -lt $Warning) {
   Write-Host "OK - Drive $Drive`:" $PercFree "free"
   exit 0;
  } elseif ($PercFree -gt $Warning -and $PercFree -lt $Critical) {
  # Set the status to Warning
   Write-Host "Warning - Drive $Drive`:" $PercFree "free"
   exit 1;
  # Set the status to Critical
  } elseif ($PercFree -gt $Critical) {
   Write-Host "CRITICAL - Drive $Drive`:" $PercFree "free"
   exit 2;
  # If all fails, give the UNKNOWN status
  } else {
   exit 3;
  }
 }
}

Then run the script with parameters

Monitor-Drives -Drives C,E -Warning 80 -Critical 90

My results…

OK - Drive C: 34,25% free
OK - Drive E: 38,31% free

Guess I’m ok for now…

Hallgrimur #TheMachine