Migrating VM from HDD Storage to SSD Premium Storage on Azure for ASM

$username = "userid@yourtenantname.onmicrosoft.com"
$password =  ConvertTo-SecureString "yourpassword" -AsPlainText -Force
$cred = new-object -typename System.Management.Automation.PSCredential `
         -argumentlist $username, $password

Add-AzureAccount -Credential $cred

$servicename = "yourservicename"
$vmname = "yourvmname"

# maybe this should be another task altogether #
Get-AzureVM -ServiceName $servicename -Name $vmname | Stop-AzureVM -force

Select-AzureSubscription "yoursubscriptionname" 
Set-AzureSubscription -SubscriptionName "yoursubscriptionname" -CurrentStorageAccount "portalvhdssomethingsource"

# VHD blob to copy #
$blobName = "yourvhdname.vhd" 

# Source Storage Account Information #
$sourceStorageAccountName = "portalvhdssomethingsource"
$sourceKey = "yourkey"
$sourceContext = New-AzureStorageContext –StorageAccountName $sourceStorageAccountName -StorageAccountKey $sourceKey  
$sourceContainer = "vhds"

# Destination Storage Account Information #
$destinationStorageAccountName = "portalvhdssomethingdestination" 
$destinationKey = "yourkey"
$destinationContext = New-AzureStorageContext –StorageAccountName $destinationStorageAccountName -StorageAccountKey $destinationKey  

# Create the destination container #
$destinationContainerName = "vhds"

# Copy the blob # 
$blobCopy = Start-AzureStorageBlobCopy -DestContainer $destinationContainerName `
                        -DestContext $destinationContext `
                        -SrcBlob $blobName `
                        -Context $sourceContext `
                        -SrcContainer $sourceContainer -Force


while(($blobCopy | Get-AzureStorageBlobCopyState).Status -eq "Pending")
{
    Start-Sleep -s 30
    $blobCopy | Get-AzureStorageBlobCopyState
}

# maybe this should be another task altogether #
Get-AzureVM -ServiceName $servicename -Name $vmname | Start-AzureVM

# set as a disk #
$AzureVHD = 'http://' + $destinationStorageAccountName + '.blob.core.windows.net/' + $destinationContainerName + '/' + $blobName

Add-AzureDisk -DiskName $vmname -MediaLocation $AzureVHD `
    -Label $vmname -OS linux