Hyper-V: Scripting Fixed VHD Creation
This script is practically identically to the one for creating a dynamically expanding virtual hard disk. The big thing to be aware of is that creation of a fixed size virtual hard disk takes a lot longer - so you need to make sure you handle the concrete job object and use it to know when the virtual hard disk has finished being created.
VBScript:
Option Explicit
'Setup constant to use for getting the right value for the new VHD size
const Size1G = &H40000000
Dim HyperVServer
Dim VHDName
Dim VHDSize
Dim WMIService
Dim Msvm_ImageManagementService
Dim Result
Dim Job
Dim InParam
Dim OutParam
'Prompt for the Hyper-V Server to use
HyperVServer = InputBox("Specify the Hyper-V Server to create the fixed virtual hard disk on:")
'Get name for VHD
VHDName = InputBox("Specify the name of the new fixed virtual hard disk:")
'Get size for VHD
VHDSize = InputBox("Specify the size of the new fixed virtual hard disk (in GB):") * Size1G
'Get an instance of the WMI Service in the virtualization namespace.
Set WMIService = GetObject("winmgmts:\\" & HyperVServer & "\root\virtualization")
'Get the Msvm_ImageManagementService object
Set Msvm_ImageManagementService = WMIService.ExecQuery("SELECT * FROM Msvm_ImageManagementService").ItemIndex(0)
'Setup the input parameter list
Set InParam = Msvm_ImageManagementService.Methods_("CreateFixedVirtualHardDisk").InParameters.SpawnInstance_()
InParam.Path = VHDName
InParam.MaxInternalSize = VHDSize
'Execute the method and store the results in OutParam
Set OutParam = Msvm_ImageManagementService.ExecMethod_("CreateFixedVirtualHardDisk", InParam)
'Check to see if the job completed synchronously
if (OutParam.ReturnValue = 0) then
Wscript.Echo "The virtual hard disk has been created."
elseif (OutParam.ReturnValue <> 4096) then
Wscript.Echo "The virtual hard disk has not been created."
else
'Get the job object
set Job = WMIService.Get(OutParam.Job)
'Wait for the job to complete (3 == starting, 4 == running)
while (Job.JobState = 3) or (Job.JobState = 4)
Wscript.Echo "Creating VHD. " & Job.PercentComplete & "% complete"
WScript.Sleep(1000)
'Refresh the job object
set Job = WMIService.Get(OutParam.Job)
Wend
'Provide details if the job fails (7 == complete)
if (Job.JobState <> 7) then
Wscript.Echo "The virtual hard disk has not been created."
Wscript.Echo "ErrorCode:" & Job.ErrorCode
Wscript.Echo "ErrorDescription:" & Job.ErrorDescription
else
Wscript.Echo "The virtual hard disk has been created."
end If
end if
PowerShell:
# Setup constant to use for getting the right value for the new VHD size
[UInt64]$Size1G = 0x40000000
# Prompt for the Hyper-V Server to use
$HyperVServer = Read-Host "Specify the Hyper-V Server to use (enter '.' for the local computer)"
# Get name for VHD
$VHDName = Read-Host "Specify the name of the new fixed virtual hard disk"
# Get size for VHD
[UInt64]$VHDSize = Read-Host "Specify the size of the new fixed virtual hard disk (in GB)"
# Get the Msvm_ImageManagementService object
$ImageManagementService = gwmi Msvm_ImageManagementService -namespace "root\virtualization" -computername $HyperVServer
# Create the VHD
$result = $ImageManagementService.CreateFixedVirtualHardDisk($VHDName, $VHDSize * $Size1G)
#Return success if the return value is "0"
if ($Result.ReturnValue -eq 0)
{write-host "The virtual hard disk has been created."}
#If the return value is not "0" or "4096" then the operation failed
ElseIf ($Result.ReturnValue -ne 4096)
{write-host "The virtual hard disk has not been created. Error value:" $Result.ReturnValue}
Else
{#Get the job object
$job=[WMI]$Result.job
#Provide updates if the jobstate is "3" (starting) or "4" (running)
while ($job.JobState -eq 3 -or $job.JobState -eq 4)
{write-host "Creating. "$job.PercentComplete "% complete"
start-sleep 1
#Refresh the job object
$job=[WMI]$Result.job}
#A jobstate of "7" means success
if ($job.JobState -eq 7)
{write-host "The virtual hard disk has been created."}
Else
{write-host "The virtual hard disk has not been created."
write-host "ErrorCode:" $job.ErrorCode
write-host "ErrorDescription" $job.ErrorDescription}
}
Cheers,
Ben