Failed to open VDDK disk error in Virtual Appliance mode, IDE virtual disks not supported

Veeam Backup & Replication
5.x, 6.x
Last Modified:


Processing the VM in Backup/Replica job in Virtual Appliance (hot-add) mode fails with the following error message:
"Backing up object "[XXX_SXN] DXX-SXX2-TXX/DXX-SXX2-TXX.vmdk"
BackupDiskFull failed
Client error: Failed to open VDDK disk [[XXX_SXN] DXX-SXX2-TXX/DXX-SXX2-TXX.vmdk] ( is read-only mode - [true] ) 
Failed to open VMDK.
Logon attempt with parameters [VC/ESX: [xxx-vcenter];Port: 443;Login [xxx-office\xxx-admin];VMX Spec: [moref-vm-401];Snapshot mor [snapshot-635];Transports: [hotadd]] failed because of the following errors:
Server error: End of file"

Check the log file of the failed job for the similar entry:
[timestamp] <20> Info           [AP] (Client) output: [timestamp] verbose 'transport'] Mounting VM vim.VirtualMachine:vm-401 using transport hotadd failed : Cannot use hotadd to transport to mount Virtual Machines with non-SCSI disks..\n
[timestamp]  <20> Info           [AP] (Client) output: [timestamp verbose 'transport'] Cannot use mode hotadd to access [XXX_SXN] DXX-SXX2-TXX/DXX-SXX2-TXX.vmdk: Cannot mount using this method.\n


The issue occurs when processing the VM with unsupported disks type like IDE virtual disks. This is one of the Virtual Appliance mode limitations.
IDE virtual disks will not be mounted to the Backup Server VM. 

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