Set-MSHVVirtualMachineMemory.ps1

#Requires -Version 5.0
#Requires -Modules Hyper-V

<#
    .SYNOPSIS
        Configures the memory of a virtual machine
    
    .DESCRIPTION
        Use "Win2K12R2 or Win8.x" for execution on Windows Server 2012 R2 or on Windows 8.1,
        when execute on Windows Server 2016 / Windows 10 or newer, use "Newer Systems"  

    .NOTES
        This PowerShell script was developed and optimized for ScriptRunner. The use of the scripts requires ScriptRunner. 
        The customer or user is authorized to copy the script from the repository and use them in ScriptRunner. 
        The terms of use for ScriptRunner do not apply to this script. In particular, ScriptRunner Software GmbH assumes no liability for the function, 
        the use and the consequences of the use of this freely available script.
        PowerShell is a product of Microsoft Corporation. ScriptRunner is a product of ScriptRunner Software GmbH.
        © ScriptRunner Software GmbH

    .COMPONENT
        Requires Module Hyper-V

    .LINK
        https://github.com/scriptrunner/ActionPacks/tree/master/Hyper-V/VMs

    .Parameter VMHostName
        [sr-en] Name of the Hyper-V host

    .Parameter HostName
        [sr-en] Name of the Hyper-V host

    .Parameter VMName
        [sr-en] Virtual machine to be configured

    .Parameter AccessAccount
        [sr-en] User account that have permission to perform this action

    .Parameter MemoryType 
        [sr-en] Virtual machine is to be configured to use static or dynamic memory

    .Parameter MemoryOnStartup 
        [sr-en] Amount of memory that the virtual machine is to be allocated upon startup, in bytes

    .Parameter MemoryMinimum 
        [sr-en] Minimum amount of memory that the virtual machine is to be allocated, in bytes
        
    .Parameter MemoryMaximum
        [sr-en] Maximum amount of memory that the virtual machine is to be allocated, in bytes

    .Parameter Buffer
        [sr-en] Percentage of memory to reserve as a buffer in the virtual machine to be configured

    .Parameter Priority
        [sr-en] Sets the priority for memory availability to this virtual machine relative to other virtual machines on the virtual machine host
#>

param(
    [Parameter(Mandatory = $true,ParameterSetName = "Win2K12R2 or Win8.x")]
    [string]$VMHostName,
    [Parameter(Mandatory = $true,ParameterSetName = "Win2K12R2 or Win8.x")]
    [Parameter(Mandatory = $true,ParameterSetName = "Newer Systems")]
    [string]$VMName,    
    [Parameter(Mandatory = $true,ParameterSetName = "Win2K12R2 or Win8.x")]
    [Parameter(Mandatory = $true,ParameterSetName = "Newer Systems")]
    [ValidateSet('Static', 'Dynamic')]
    [string]$MemoryType = "Static",
    [Parameter(ParameterSetName = "Newer Systems")]
    [string]$HostName,
    [Parameter(ParameterSetName = "Newer Systems")]
    [PSCredential]$AccessAccount,
    [Parameter(ParameterSetName = "Win2K12R2 or Win8.x")]
    [Parameter(ParameterSetName = "Newer Systems")]
    [uint64]$MemoryOnStartup,
    [Parameter(ParameterSetName = "Win2K12R2 or Win8.x")]
    [Parameter(ParameterSetName = "Newer Systems")]
    [uint64]$MemoryMinimum,
    [Parameter(ParameterSetName = "Win2K12R2 or Win8.x")]
    [Parameter(ParameterSetName = "Newer Systems")]
    [uint64]$MemoryMaximum,
    [Parameter(ParameterSetName = "Win2K12R2 or Win8.x")]
    [Parameter(ParameterSetName = "Newer Systems")]
    [ValidateRange(5,2000)] 
    [int]$Buffer,
    [Parameter(ParameterSetName = "Win2K12R2 or Win8.x")]
    [Parameter(ParameterSetName = "Newer Systems")]
    [ValidateRange(0,100)] 
    [int]$Priority
)

Import-Module Hyper-V

try {
    if($PSCmdlet.ParameterSetName  -eq "Win2K12R2 or Win8.x"){
        $HostName=$VMHostName
    }    
    if([System.String]::IsNullOrWhiteSpace($HostName)){
        $HostName = "."
    }
    if($null -eq $AccessAccount){
        $Script:VM = Get-VM -ComputerName $HostName -ErrorAction Stop | Where-Object {$_.VMName -eq $VMName -or $_.VMID -eq $VMName}
    }
    else {
        $Script:Cim = New-CimSession -ComputerName $HostName -Credential $AccessAccount
        $Script:VM = Get-VM -CimSession $Script:Cim -ErrorAction Stop | Where-Object {$_.VMName -eq $VMName -or $_.VMID -eq $VMName}
    }        
    if($null -ne $Script:VM){
        if($MemoryType -eq "Static"){
            Set-VMMemory -VM $Script:VM -DynamicMemoryEnabled $false -ErrorAction Stop
        }
        else {
            Set-VMMemory -VM $Script:VM -DynamicMemoryEnabled $true -ErrorAction Stop
            if($PSBoundParameters.ContainsKey('MemoryOnStartup') -eq $true ){
                Set-VMMemory -VM $Script:VM -StartupBytes $MemoryOnStartup -ErrorAction Stop
            }
            if($PSBoundParameters.ContainsKey('MemoryMinimum') -eq $true ){
                Set-VMMemory -VM $Script:VM -MinimumBytes $MemoryMinimum -ErrorAction Stop
            }
            if($PSBoundParameters.ContainsKey('MemoryMaximum') -eq $true ){
                Set-VMMemory -VM $Script:VM -MaximumBytes $MemoryMaximum -ErrorAction Stop
            }
            if($PSBoundParameters.ContainsKey('Buffer') -eq $true ){
                Set-VMMemory -VM $Script:VM -Buffer $Buffer -ErrorAction Stop
            }
        }
        if($PSBoundParameters.ContainsKey('Priority') -eq $true ){
            Set-VMMemory -VM $Script:VM -Priority $Priority -ErrorAction Stop
        }
        $output = Get-VMMemory -VM $Script:VM | Select-Object *
        if($SRXEnv) {
            $SRXEnv.ResultMessage = $output
        }    
        else {
            Write-Output $output
        }
    }
    else{
        if($SRXEnv) {
            $SRXEnv.ResultMessage = "Virtual machine $($VMName) not found"
        }    
        Throw "Virtual machine $($VMName) not found"
    }
}
catch {
    throw
}
finally{
    if($null -ne $Script:Cim){
        Remove-CimSession $Script:Cim 
    }
}