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- Hot-Add/Virtual Appliance Failures for Restored or Cloned Backup Proxy
Hot-Add/Virtual Appliance Failures for Restored or Cloned Backup Proxy
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Challenge
A backup or replication job fails with the following error when using a VMware Backup Proxy when that proxy is attempting to use Virtual Appliance transport mode (hotadd):
BackupDiskTrad failed
Client error: Failed to open VDDK disk [[My_Datastore] VM_Name/Disk1.vmdk] ( is read-only mode - [true] )
Logon attempt with parameters [VC/ESX: [vcenter];Port: 443;Login: [domain\veeam_user];VMX Spec: [moref=vm-5555];Snapshot mor: [snapshot-55];Transports: [hotadd]] failed because of the following errors:
Server error: End of file
Also, the VMware Backup Proxy may have been moved or cloned recently, causing the UUID of the Proxy to change.
Cause
After moving, cloning, or restoring a VMware Backup Proxy, the UUID at the VMware level does not match the UUID that Microsoft gives a machine. When this occurs, the ESXi host Veeam is trying to do hot-add/virtual appliance mode with cannot find the VM by the UUID provided, as it has changed and is no longer valid.
Solution
Once the issue has been isolated to a specific VMware Backup Proxy, run the following PowerShell script on that proxy to remediate the issue:
# Get OS UUID
$uuidArray = ((Get-WmiObject Win32_ComputerSystemProduct).UUID).split("-")
# Convert to vSphere bios.uuid format
for ($j = 0; $j -lt 5; $j++) {
$tempArray = @()
$segment = $uuidArray[$j]
for ($i = 0; $i -lt $segment.length; $i += 2) {
$tempArray += $segment[$i] + $segment[$i + 1]
}
if ($j -lt 3) { [array]::Reverse($tempArray) }
$uuidArray[$j] = -join ($tempArray -join " ")
}
$uuidArray[3] = "-" + $uuidArray[3]
$outputUuid = [string]::Join(" ", $uuidArray) -replace " -", "-"
# Write converted UUID to registry value
New-Item 'HKLM:\SOFTWARE\Wow6432Node\VMware, Inc.\volatile\' -Force | New-ItemProperty -Name "UUIDHost" -value $outputUuid -Force
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