Table of Contents

ISSUE: Fail to connect VM disk by VDDK library. Error=Unknown (VMware VDDK backup)

Reviewed: 28/08/2020

Product Version:

CloudBacko Pro : v4.1 or above

OS: Windows

Problem Description

When performing a VMware guest VM backup in VDDK mode on VMware vCenter / ESXi version 5.0.x, 5.1.x, or 5.5.x, the following error message is received in the backup report:

No. Type Timestamp Log
* info … …
* erro YYYY/MM/DD hh:mm:ss Fail to connect VM disk by VDDK library “ error: “VDDK Mode Error Virtual Machine = “VM/Hard disk” Reason = “Fail to connect VM disk by VDDK library”. Error=Unknown
* … … …

Cause

This issue occurs because the VMware VDDK 7 API used in CloudBacko Pro v4.1 or above, are not supported by VMware vCenter / ESXi version 5.0.x, v5.1.x, and v5.5.x for backup in VDDK mode.

Resolution

To workaround this issue, replace the current VDDK 7 API with the VDDK 6 API files, Click Here to download the VDDK v6 API files. Refer to the following steps to replace the files:

  • diskLibPlugin.dll
  • libexpat.dll
  • lookup-types.dll
  • msvcp120.dll
  • msvcr120.dll
  • pcre.dll
  • sqlite3.dll
  • ssoclient.dll
  • vddkVimAccess.dll
  • vim-types.dll
  • vmacore.dll
  • vmomi.dll
  • zlib1.dll

After replacing the VDDK 7 API files with the VDDK 6 API files, CloudBacko Pro v4.1 or above can no longer support backup of VMware vCenter / ESXi v7 backup sets. Please replace the files at your own discretion.

Here is the list of VDDK 6 API files (17 files in total):