Get-ClusterNodeMemory.ps1

function Get-ClusterNodeMemory {
    <#
      .Synopsis
      Get the available memory of each node in a cluster.
      .DESCRIPTION
      Get the available memory of each node in a cluster particularly for Hyper-V.

      .PARAMETER Cluster
      Provide Cluster Name. Will accept an array of cluter names

      .PARAMETER Credential
      Optional PSCredential Parameter

      .EXAMPLE
      Get-ClusterNodeMemory -Cluster Cluster0 | Format-Table -AutoSize
      will return all not down nodes memory statistics

      Cluster     ComputerName   FreePhysicalMemory TotalVisibleMemorySize % Free
      -------     ------------   ------------------ ---------------------- ------
      Cluster0    ClusterNode1                  231                    512  45,05
      Cluster0    ClusterNode2                  249                    512  48,66
      Cluster0    ClusterNode3                  195                    512  38,01
      Cluster0    ClusterNode4                  267                    512  52,16
      Cluster0    ClusterNode5                  292                    512  57,05
      Cluster0    ClusterNode6                  172                    512  33,64

      .EXAMPLE
      Get-ClusterNodeMemory -Cluster Cluster0,Cluster1 -Credential (Get-Credential) | Format-Table -AutoSize
      Will return all nodes memory statistics from two clusters using provided Credentials

      Cluster     ComputerName   FreePhysicalMemory TotalVisibleMemorySize % Free
      -------     ------------   ------------------ ---------------------- ------
      Cluster0    ClusterNode1                230                      512  45,02
      Cluster0    ClusterNode2                249                      512  48,65
      Cluster0    ClusterNode3                195                      512     38
      Cluster0    ClusterNode4                267                      512  52,16
      Cluster0    ClusterNode5                292                      512  56,99
      Cluster0    ClusterNode6                172                      512  33,63
      Cluster1    ClusterNode1                  1                        2  53,53
      Cluster1    ClusterNode2                  1                        2  45,37


  #>
    [CmdletBinding()]
    param(
        [Parameter(Mandatory, HelpMessage = 'Provide Cluster Name',
            ValueFromPipeline, ValueFromPipelineByPropertyName)]
        [ValidateNotNullOrEmpty()]
        [System.String[]]
        $Cluster,

        [Parameter(Mandatory = $false, HelpMessage = 'Provide Credentials for Cluster',
            ValueFromPipeline, ValueFromPipelineByPropertyName)]
        [System.Management.Automation.PSCredential]
        $Credential
    )

    process {
        foreach ($ClusterName in $Cluster) {
            $connectionParams = @{
                ComputerName = $ClusterName
            }
            if ($PSBoundParameters.ContainsKey('Credential')) {
                $connectionParams.Credential = $Credential
                Write-Verbose -Message "Processing with provided credentials {$($Credential.UserName)}"
            }
            else {
                Write-Verbose -Message "Processing with default credentials of user {$($env:USERNAME)}"
            }

            #region CODE
            Write-Verbose -Message "Processing Cluster {$ClusterName}"
            Write-Verbose -Message "Retrieving cluster nodes from cluster {$ClusterName} which are not [Down]"
            $clusterNodes = Invoke-Command @connectionParams -ScriptBlock {
                Get-ClusterNode | Where-Object {$PSItem.State -ne "Down"}
            }
            foreach ($clNode in $clusterNodes) {
                $wmiConnectionParams = @{
                    ComputerName = $clNode.Name
                }
                if ($PSBoundParameters.ContainsKey('Credential')) {
                    $wmiConnectionParams.Credential = $Credential
                }
                Write-Verbose -Message "Retrieving memory statistics from node {$($clNode.Name)} from cluster {$Cluster}."
                $selectObjectFilter = @(
                    @{name = 'Cluster'; e = {$ClusterName}},
                    @{name = 'ComputerName'; e = {$PSItem.__SERVER}},
                    @{name = 'FreePhysicalMemory'; e = {$PSItem.FreePhysicalMemory / 1MB -as [int]}},
                    @{name = 'TotalVisibleMemorySize'; e = {$PSItem.TotalVisibleMemorySize / 1MB -as [int]}},
                    @{name = '% Free'; e = {[System.Math]::Round(($PSItem.FreePhysicalMemory / $PSItem.TotalVisibleMemorySize * 100), 2)}}
                )
                Get-WmiObject win32_operatingsystem @wmiConnectionParams | Select-Object $selectObjectFilter
            }
        }
    }
}