Hyper-V Cluster - Get Nodes Memory Usage
Why
Similar as before (here) having information about your cluster nodes memory usage can be helpful. Especially when creating a bunch of new VMs.
How
- I can get the information from Failover Cluster Manager (one node at a time):
- I can get it using Windows Admin Center
- or I can get it through PowerShell
The PowerShell way
Because both solutions (Failover Cluster Manager and WAC) lack the flexibility (node by node, or no accurate number) i prefer PowerShell.
As I mentioned before - I tend to use alternative credentials to access critical resources. Unfortunately Get-ClusterNode doesn’t accept Credential parameter. So, despite it’s possible to query nodes directly, I’d rather use Invoke-Command to access cluster information. This way I can connect cross-domain as well. Then, the information I need can be easily retrieved using WMI:
Get-WmiObject -Class win32_operatingsystem -ComputerName $ClusterNode
It’s good to have all active nodes in a cluster queried with one sweep. I’ll be using Select-Object to filter the output. It’s easier to read the code that way (link).
Let’s wrap it into a function:
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| 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 | |
| } | |
| } | |
| } | |
| } |
The output will be like this:
This comes quite handy for a quick glance:
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