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VM backup fails with error VMWARE VMOMI65535


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

How to collect the detailed job logs

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>

Reference : Use the vmcontrol utility to enable CBT

OR disable it from within VSphere console 

Reference : Powering on a VM configured with the multi-writer flag enabled fails with error: Cannot open the disk '/vmfs/volumes/datastore/vmfolder/.disk.vmdk' or one of the snapshot disks it depends on (2110452)

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