Get used CPU%, Disk% & memory % counters - windows

Question

I am trying to get these 3 counters thru PowerShell, could you help? Something like below:
Hostname1 : CPU% : 75%
Hostname1 : MEM% : 55%
Hostname1 : Disk1 % : 15%
Hostname1 : Disk2 % : 10%
Hostname1 : Disk3 % : 13%
Hostname1 : Disk4 % : 12%
Hostname2 : CPU% : 75%
Hostname2 : MEM% : 55%
Hostname2 : Disk1 % : 11%
Hostname2 : Disk2 % : 15%
Hostname2 : Disk3 % : 15%
Note: I could not find a counter for %used/memory so I am not going thru performance counters.

Answer 1

Likely your easiest method is using WMI. The below is a script I wrote up for you to demonstrate the ability.
You would need to work on the formatting and I left out disk stats - so some work required.
# Lets import our list of computers
$computers = get-Content .\computer-list.txt
# computer-list.txt is your hostnames each on a new line
# Lets create our variables
$HostInfo = #()
# Lets loop through our computer list from computers
foreach ($computer in $computers) {
# Lets get our stats
# Lets create a re-usable WMI method for CPU stats
$ProcessorStats = Get-WmiObject win32_processor -computer $computer
$ComputerCpu = $ProcessorStats.LoadPercentage
# Lets create a re-usable WMI method for memory stats
$OperatingSystem = Get-WmiObject win32_OperatingSystem -computer $computer
# Lets grab the free memory
$FreeMemory = $OperatingSystem.FreePhysicalMemory
# Lets grab the total memory
$TotalMemory = $OperatingSystem.TotalVisibleMemorySize
# Lets do some math for percent
$MemoryUsed = ($FreeMemory/ $TotalMemory) * 100
$PercentMemoryUsed = "{0:N2}" -f $MemoryUsed
# Lets throw them into an object for outputting
$objHostInfo = New-Object System.Object
$objHostInfo | Add-Member -MemberType NoteProperty -Name Name -Value $computer
$objHostInfo | Add-Member -MemberType NoteProperty -Name CPULoadPercent -Value $ComputerCpu
$objHostInfo | Add-Member -MemberType NoteProperty -Name MemoryUsedPercent -Value $PercentMemoryUsed
# Lets dump our info into an array
$HostInfo += $objHostInfo
}
# Lets output to the console
$HostInfo

Answer 2

This works:
$system = Get-WmiObject win32_OperatingSystem
$totalPhysicalMem = $system.TotalVisibleMemorySize
$freePhysicalMem = $system.FreePhysicalMemory
$usedPhysicalMem = $totalPhysicalMem - $freePhysicalMem
$usedPhysicalMemPct = [math]::Round(($usedPhysicalMem / $totalPhysicalMem) * 100,1)
$driveLetters = Get-WmiObject Win32_Volume | select DriveLetter
foreach ($driveLetter in $driveLetters)
{
$drive = Get-WmiObject Win32_Volume | where {$_.DriveLetter -eq $driveLetter.DriveLetter}
$usedDiskSpace = $drive.Capacity - $drive.FreeSpace
$usedDiskSpacePct = [math]::Round(($usedDiskSpace / $drive.Capacity) * 100,1)
}