Create Hyper-V Virtual Machines with Windows PowerShell searching on hostname

Question

Dear,
I’m a starter with PowerShell scripting an I’m looking for a script to create Hyper-V Virtual Machines with Windows PowerShell. The idea behind the script is that when I run the script its first searching for the hostname. I’m migrating 24 locations and each
location have a different hostname like xxx-SRV001. The script needs to use the first 3 signs from the hostname in this case “xxx” and create 2 VM's with below info:
Virtual Machine 1 2048MB
Virtual Machine 2 4096MB
Location D:\VM\
I can create VM's with Powershell into Hyper-V so only a script to first searching for the first 3 characters of the hostname is enough.
Example:
It's the intention that when the script runs it's looking for the hostname. As example we have hostname 000-SRV001
If the script see the first 3 characters of the hostname, in this case 000 he need to create 2 VMs with name xxx-SRV002 and xxx-SRV004
I think it must be something with 
$hostname = "Get-WmiObject -computername $Machine Win32_Computersystem"
But then when i'm asking for $hostname he must give me back the hostname and if the hostname is 1 of the 24 locations then he need to create 2 vm's in Hyper-V with above info.
Can you help me or do you have a script for this? 

Answer 1

Juste use :
$vram = 1GB*$vRam
You not need the "
Do you have any error with the creation of the VM?
# Variables
$VMName = Import-Csv "C:\HyperV\input.csv"
$VHD = 40GB
$VMLOC = "C:\HyperV"
$vSwitch = "External"
$ISO = "C:\ISO\WinServer2012R2.iso"
$LocationCode = $env:COMPUTERNAME.Split("-")[0]
# Create VM Folder
MD $VMLOC -ErrorAction SilentlyContinue
Foreach ($VM in $VMNames)
$Name = $VM.name
[int64]$vRam = $vm.vram
$vram = 1GB*$vRam
$VMName = $LocationCode+$Name
# Create Virtual Machine
New-VM -Name $VMName -Path $VMLOC -MemoryStartupBytes $vRam -NewVHDPath "$VMLOC\$VMName\Virtual Harddisks\$VMName.vhdx" -NewVHDSizeBytes $VHD -SwitchName $vSwitch
# Configure Virtual Machines
Set-VMDvdDrive -VMName $VMName -Path $ISO
Start-VM $VMName
# Configure Virtual Machines
Set-VMDvdDrive -VMName $VMName -Path $ISO
Start-VM $VMName
Error message 
New-VM : '003' failed to modify device 'Memory'. (Virtual machine ID 8F5F32D7-F1A0-4A68-8B01-CA6661869A1E)
Invalid startup memory amount assigned for '003'. The minimum amount of memory you can assign to this virtual machine is '32' MB. (Virtual machine ID 8F5F32D7-F1A0-4A68-8B01-CA6661869A1E)
A parameter that is not valid was passed to the operation.
At line:20 char:5
+ New-VM -Name $VMName -Path $VMLOC -MemoryStartupBytes $vRam -NewVHDPath "$VM ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (Microsoft.HyperV.PowerShell.VMTask:VMTask) [New-VM], VirtualizationOperationFailedException
+ FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.NewVMCommand
Set-VMDvdDrive : A parameter is invalid. Hyper-V was unable to find a virtual machine with name 003.
At line:23 char:5
+ Set-VMDvdDrive -VMName $VMName -Path $ISO
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (003:String) [Set-VMDvdDrive], VirtualizationInvalidArgumentException
+ FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.SetVMDvdDriveCommand
Start-VM : A parameter is invalid. Hyper-V was unable to find a virtual machine with name 003.
At line:24 char:5
+ Start-VM $VMName
+ ~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (003:String) [Start-VM], VirtualizationInvalidArgumentException
+ FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.StartVMCommand
Set-VMDvdDrive : A parameter is invalid. Hyper-V was unable to find a virtual machine with name 003.
At line:27 char:5
+ Set-VMDvdDrive -VMName $VMName -Path $ISO
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (003:String) [Set-VMDvdDrive], VirtualizationInvalidArgumentException
+ FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.SetVMDvdDriveCommand
Start-VM : A parameter is invalid. Hyper-V was unable to find a virtual machine with name 003.
At line:28 char:5
+ Start-VM $VMName
+ ~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (003:String) [Start-VM], VirtualizationInvalidArgumentException
+ FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.StartVMCommand
New-VM : '003' failed to modify device 'Memory'. (Virtual machine ID C0FC835E-36D4-462E-BD21-69A75A808E2F)
Invalid startup memory amount assigned for '003'. The minimum amount of memory you can assign to this virtual machine is '32' MB. (Virtual machine ID C0FC835E-36D4-462E-BD21-69A75A808E2F)
A parameter that is not valid was passed to the operation.
At line:20 char:5
+ New-VM -Name $VMName -Path $VMLOC -MemoryStartupBytes $vRam -NewVHDPath "$VM ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (Microsoft.HyperV.PowerShell.VMTask:VMTask) [New-VM], VirtualizationOperationFailedException
+ FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.NewVMCommand
Set-VMDvdDrive : A parameter is invalid. Hyper-V was unable to find a virtual machine with name 003.
At line:23 char:5
+ Set-VMDvdDrive -VMName $VMName -Path $ISO
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (003:String) [Set-VMDvdDrive], VirtualizationInvalidArgumentException
+ FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.SetVMDvdDriveCommand
Start-VM : A parameter is invalid. Hyper-V was unable to find a virtual machine with name 003.
At line:24 char:5
+ Start-VM $VMName
+ ~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (003:String) [Start-VM], VirtualizationInvalidArgumentException
+ FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.StartVMCommand
Set-VMDvdDrive : A parameter is invalid. Hyper-V was unable to find a virtual machine with name 003.
At line:27 char:5
+ Set-VMDvdDrive -VMName $VMName -Path $ISO
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (003:String) [Set-VMDvdDrive], VirtualizationInvalidArgumentException
+ FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.SetVMDvdDriveCommand
Start-VM : A parameter is invalid. Hyper-V was unable to find a virtual machine with name 003.
At line:28 char:5
+ Start-VM $VMName
+ ~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (003:String) [Start-VM], VirtualizationInvalidArgumentException
+ FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.StartVMCommand