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VM backup fails with error VMWARE VMOMI65535
Updated over a week ago

Problem description

VMware VM backup fails with error VMWARE_VMOMI65535


CBT is not supported for VM having multi-writer disk(s) by VMware


Download the detailed job logs as per the article

The detailed job logs show the error message

[2022-10-19 04:06:38,202] [ERROR] Error <class 'pyVmomi.VmomiSupport.vmodl.fault.NotSupported'>:(vmodl.fault.NotSupported) {
dynamicType = <unset>,
dynamicProperty = (vmodl.DynamicProperty) [],
msg = 'The operation is not supported on the object.',
faultCause = <unset>,
faultMessage = (vmodl.LocalizableMessage) [
(vmodl.LocalizableMessage) {
dynamicType = <unset>,
dynamicProperty = (vmodl.DynamicProperty) [],
key = 'com.vmware.vim.vpxd.vmcheck.cbtAndMultiwriterVmNotSupported',
arg = (vmodl.KeyAnyValue) [],
message = 'CBT-enabled VM having multi-writer disk(s) is not supported'


  1. Create a new policy for this VM and disable CBT in the policy

  1. Also disable the CBT for this VM

  1. To disable the CBT from backup proxy, use the following command:


vmcontrol disable_cbt <VM_Name>

OR disable it from within VSphere console

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