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Hot-Add/Virtual Appliance Failures

KB ID: 1332
Product: Veeam Backup & Replication
Version: All
Published: 2011-11-04
Last Modified: 2021-05-03

Challenge

A backup or repliaction job fails with the following error when using a VMware Backup Proxy when that proxy is attempting to using 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 on the VMware side and the UUID that Microsoft gives a machine can become mismatched. When this occurs the ESXi host Veeam is trying to do hot-add/virtual appliance mode with cannot find the UUID provided, as it has changed and is no longer valid.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:
$uuid = (Get-WmiObject Win32_ComputerSystemProduct).UUID
$array_uuid = @()
$array_uuid += $uuid.split("-")
$tempArray = @()
for($j = 0; $j -lt 5;$j++)
{
    $tempArray = @()
    for($i=0;$i -lt $array_uuid[$j].length;$i+=2)   
    {
        $tempArray += $array_uuid[$j][$i] + $array_uuid[$j][$i+1]
    }
    if($j -lt 3){ [array]::Reverse($tempArray)}
    $array_uuid[$j] = $tempArray
}
$array_uuid[3][0] = $array_uuid[3][0].Insert(0, "-")
$myUuid = ($array_uuid | Out-String).Replace("`n"," ").Replace(" -","-")
if((Get-WmiObject -Class Win32_ComputerSystem).SystemType -match "(x86)")
    {Set-ItemProperty "HKLM:\software\VMware, Inc.\VMware Virtual Disk Development Kit\volatile\" -Name "UUIDHost" -value $myUuid}
else
    {Set-ItemProperty "HKLM:\software\Wow6432Node\VMware, Inc.\volatile\" -Name "UUIDHost" -value $myUuid}
KB ID: 1332
Product: Veeam Backup & Replication
Version: All
Published: 2011-11-04
Last Modified: 2021-05-03

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