Don't think there is an option to compress the transferred files.
I have been experimenting with a script that uses the ExportVM method and then the HttpNfc methods to download the files.
I have been playing with the buffersize for reading and writing the transferred files.
By playing with size, you try to find the sweet spot for the duration of the Export.
Have a try, and let me know if it improves the Export duration.
#
# When in vSphere 6.5 ==> connect to the ESXi node
#
$vmName = 'TestVM'
$ovfPath = 'C:\OVFFolder'
# Advanced export options
$includeMac = $true
$includeUuid = $true
$includeExtraConfig = $true
$si = Get-View ServiceInstance
$ovfMgr = Get-View -Id $si.Content.OvfManager
$vm = Get-VM -Name $vmName
$lease = Get-View -Id ($vm.ExtensionData.ExportVm())
$files = @()
while($lease.State -eq [VMware.Vim.HttpNfcLeaseState]::initializing){
sleep 1
$lease.UpdateViewData('State')
}
$lease.UpdateViewData()
if($lease.State -eq [VMware.Vim.HttpNfcLeaseState]::ready){
Write-Host "Lease timeout $($lease.Info.LeaseTimeout)"
$bufferSize = 10KB
$Timeout = 300
$bytesWritten = 0
foreach($device in ($lease.Info.DeviceUrl | where{$_.Disk})){
Write-Host "Transferring $($device.Url.Split('/')[-1])"
$ovfFile = "$($ovfPath)\$($device.Url.Split('/')[-1])"
$url = $device.Url.Replace('*',$vm.VMHost.Name)
$webRequest = [System.Net.WebRequest]::Create($url)
$response = $webRequest.GetResponse()
$responseStream = $response.GetResponseStream()
$fileStream = [System.IO.File]::OpenWrite($ovfFile)
$chunk = New-Object byte[] $bufferSize
while (($bytesRead = $responseStream.Read($chunk,0,$bufferSize)))
{
$totalBytesRead += $bytesRead
$fileStream.Write($chunk,0,$bytesRead)
$fileStream.Flush()
}
$bytesWritten += $fileStream.Length
$ovfFileObj = New-Object VMware.Vim.OvfFile
$ovfFileObj.DeviceId = $device.Key
$ovfFileObj.Path = $device.Url.Split('/')[-1]
$ovfFileObj.Size = $fileStream.Length
$files += $ovfFileObj
$FileStream.Close()
$responseStream.Close()
$lease.HttpNfcLeaseProgress([int]($bytesWritten/($lease.Info.TotalDiskCapacityInKB * 1KB) *100))
Write-Host "Bytes written $($bytesWritten)"
}
$cdp = New-Object VMware.Vim.OvfCreateDescriptorParams
$cdp.Description = 'Test OVF Export'
$cdp.Name = "$($vmName)"
if($includeMac){
$cdp.ExportOption += 'mac'
}
if($includeUuid){
$cdp.ExportOption += 'uuid'
}
if($includeExtraConfig){
$cdp.ExportOption += 'extraconfig'
}
$cdp.OvfFiles = $files
$ovfResult = $ovfMgr.CreateDescriptor($vm.ExtensionData.MoRef,$cdp)
([xml]$ovfResult.OvfDescriptor).Save("$($ovfPath)\$($vmName).ovf")
$lease.HttpNfcLeaseProgress(100)
$lease.HttpNfcLeaseComplete()
Write-Host "Export complete"
}
else{
Write-Host "Export failed"
Write-Host $lease.Error[0].LocalizedMessage
}
