User`s guide

Quest NetVault Backup Plug-in
for VMware User’s Guide
77
Chapter 9:
TROUBLESHOOTING
 Common Errors
 SOAP Messages
 VDDK Logs
9.1.0 Common Errors
This section describes some common errors and their solution.
Description Symptom Solution
Plug-in crashes
during a backup.
During a backup, the plug-in
crashes with the following error
in the NVBU Logs:
Backing up data of VM disk
[XXXXXXX]xxx/xxxx-
xxxxx.vmdk' to media : “Job
manager lost message
channel unexpectedly.”
The Trace Logs include the
following error:
Cannot open library:
libexpat.so.0: cannot open
shared object file in
vixDiskLib-16642.log.
This is a Linux library problem. To
correct this problem, navigate to
the /usr/lib directory, and create
the following symbolic link:
ln -s /lib/libexpat.so.1.5.2
libexpat.so.0
CBT-based
Image-level
backup fails.
An image-level backup for which
CBT has been enabled fails with
the following error message in
the NVBU Logs:
“Failed to get changed disk
areas.”
This issue occurs when a snapshot
already exists on a virtual machine
when CBT is enabled. For
snapshots that exist before
enabling CBT, the changeId
parameter is not set. So, when the
QueryChangedDiskAreas API is
invoked, it returns an error. For
more information, refer to http://
kb.vmware.com/kb/1033816. To
correct this problem, ensure that no
snapshots exist on the virtual
machine before selecting the
Enable Changed Block Tracking
for VM check box for the initial
backup.