I have recently deployed a VDR 2.0 appliance, after using 1.2 for almost 2 years.
With the new appliance, I'm having lots of problems due to backups silently failing. They are not performed, but there is no error or warning in log.
Within some minutes (usually 5 to 10), the missing disks reappear (without any user intervention!), and backup jobs list again the VMs that were previously missing, showing that they are out of date.
At that point I can manually start a backup, and it performs without problems.
If I don't connect to the appliance for two or three days, the problem reappears, involving one or more VMs night after night. Once a VM "loses" its disks, the only way to make it visible again to VDR is connecting to the appliance from vSphere Client and waiting for some minutes.
This is happening on a 2-node ESXi 5.0.0 cluster. hosting 13 VMs (12 + VDR). Over time, I have experienced the problem with all of the VMs. This morning, for example, I've found 8 VMs with missing backups (and without disks in VDR, as described above). Four of them were without backups since Jan 24th, another one since Jan 25th, another one since Jan 26, the others from Feb 3.
Thanks in advance for any help or suggestion.