This is a handy little snippet of code that you can run on a Hyper-V server prior to performing a maintenance action. It will capture all the critical information you might want to know about the Hyper-V server and dumps it to a text file so you can reference during and after a maintenance process.

Hyper-V_Data_Capture.ps1

#---------------------------------------------------------
$hostname = $env:COMPUTERNAME
$path = "C:\logging"
$vms = Get-VM
#---------------------------------------------------------
$hostname | Out-File $path\$hostname.txt -Append
ipconfig /all | Out-File $path\$hostname.txt -Append
Get-NetAdapter -ErrorAction SilentlyContinue | Out-File $path\$hostname.txt -Append
Get-VMSwitch -ErrorAction SilentlyContinue | Out-File $path\$hostname.txt -Append
Get-Cluster -ErrorAction SilentlyContinue | Out-File $path\$hostname.txt -Append
Get-ClusterGroup -ErrorAction SilentlyContinue | Out-File $path\$hostname.txt -Append
Get-ClusterResource -ErrorAction SilentlyContinue | Out-File $path\$hostname.txt -Append
Get-ClusterNetwork -ErrorAction SilentlyContinue | Out-File $path\$hostname.txt -Append
Get-Disk -ErrorAction SilentlyContinue | Out-File $path\$hostname.txt -Append
Get-Volume -ErrorAction SilentlyContinue | Out-File $path\$hostname.txt -Append
Get-WindowsFeature  -ErrorAction SilentlyContinue | Where-Object {$_.installed -eq "True"} | Out-File $path\$hostname.txt -Append
Get-WmiObject -Class Win32_Product -ErrorAction SilentlyContinue | Out-File $path\$hostname.txt -Append
$vms = Get-VM -ErrorAction SilentlyContinue
$vms | Out-File $path\$hostname.txt -Append
#now get all VHD files associated with those VMs
foreach ($VM in $VMs ) {
    $VM.Name | Out-File $path\$hostname.txt -Append
    Get-VHD -VMId $VM.VMId | `
        Format-Table `
            vhdtype, `
            @{label = ’Size(GB)’; expression = {$_.filesize / 1gb –as [int]}}, `
            @{label = ’MaxSize(GB)’; expression = {$_.size / 1gb –as [int]}}, `
            path `
            -AutoSize | Out-File $path\$hostname.txt -Append
    "------------------------------" | Out-File $path\$hostname.txt -Append
}