Article ID: 8082
Reviewed: 2021-01-28

Product Version:
AhsayOBM: 8.3.4.0 to 8.x
OS: Windows

When performing a VMware guest VM backup in VDDK mode on VMware vCenter / ESXi, 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
*	...	...	...

This issue occurs because the VMware VDDK 7 API used in AhsayOBM version 8.3.4.0 - 8.3.6.125 are not supported by VMware vCenter / ESXi for backup in VDDK mode.

To resolve the issue, patch the AhsayOBM application to version 8.5 or above. The instructions can be found by Clicking Here.

Important: It is highly recommended for user to upgrade the AhsayOBM application to 8.5 or above.

Alternatively, 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:

1. Stop the AhsayOBM service.


2. Stop the AhsayOBM NFS service.


3. In Windows Explorer, make a copy of the current folder %OBM_Install_home%\bin\x64.


4. Open the folder %OBM_Install_home\bin\x64.


5. Delete the following .dll files (13 files in total):
   
   
   • 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


6. Unzip the downloaded vddk.zip file and copy its contents to the %OBM_Install_home%\bin\x64 folder.


7. Restart the AhsayOBM service.


8. Restart the AhsayOBM NFS service.

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

glib-2.0.dll
gobject-2.0.dll
gthread-2.0.dll
gvmomi.dll
iconv.dll
intl.dll
libcurl.dll
libeay32.dll
liblber.dll
libldap.dll
libldap_r.dll
libxml2.dll
ssleay32.dll
VddkJNI.dll
vixDiskLib.dll
vixDiskLibVim.dll
vixMntapi.dll

VMware vCenter/ESXi, VDDK, API, fail to connect, unknown