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
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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: