Powershell Scripting with Hyper-V and PoC

Question

Hi Guys,

I'm currently working on a powershell script to build my PoC environment and using the following code to set memory for each of my VMs

$MemoryAvailable = (Get-VMHostNumaNode).MemoryAvailable/4

I'm splitting the total memory by 4 to get the number which in this case for 16GB computer is 4067. Then I'm rounding it off to 4GB as per next command

$maxRAM = ([math]::round($MemoryAvailable /1024)).tostring() + "GB"

So now I get 4GB for $maxRAM variable but once I do that it makes it a "string" type and NOT an "int" type which then won't allow me to use variable $maxRAM in the following command

Set-VMMemory -VMName $VMName -DynamicMemoryEnabled $true -MinimumBytes 512MB -MaximumBytes $maxRAM -Buffer 20

So this part "-MaximumBytes $maxRAM" fails with the following

Set-VMMemory : Cannot bind parameter 'MaximumBytes'. Cannot convert value "4GB" to type "System.Int64". Error: "Input string was not in a correct format."

Some assistance to get around this would be much appreciated?

Thanks

Shane

Answer 1

Why not do this instead?

$maxRAM = [int64]([math]::round($MemoryAvailable /1024)) * 1024*1024*1024

Or this?

$maxRAM = [int64]([math]::round($MemoryAvailable /1024)) * 1GB

EDIT: cast the result to be [int64] instead of the [double] type that results from dividing 4067 by 4 in the original post.

Answer 2

Hi,

You don't have to covert $maxRAM to string since -MaximumBytes accepts Int64. Just use ([math]::round($MemoryAvailable /1024)) * 1GB. In addition, (Get-VMHostNumaNode).MemoryAvailable is an array of the memory of all the numa nodes. It cannot be devided unless you have only one node. You should add them up to get the total memory

$MemoryAvailable = (Get-VMHostNumaNode | Measure-Object -Property MemoryAvailable -Sum).sum/4  
$maxRAM = ([math]::round($MemoryAvailable /1024)) * 1GB  

Best Regards，
Ian

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