Looks to be an error coming from VDDK library. Can you check the VDDK logs (vixdisklib.log) to get more info.

Dear Sunil,

VDDK logs (vixdisklib.log) in a MA?

check on VSA proxy host.

How to find VSA proxy host in environment?

Right click the instance within the hypervisor cliënt, select properties and go to access node tab to view assigned nodes and frel.

Or check the proxy column shown in your printscreen.

Hi Abhiman,

Out of interest what Service Pack / Feature Release version are you running on?

Thanks,
Shaun

Luckily @Jos Meijer seems to have the right crystal ball as he was the one giving the correct solution….. 

Question: we have a backup job that before failed and the error was Could not read data from the virtual disk.

The backup job took 40 hours before it failed.

Is there anything in the active job that will tell me the backup job will fail again with the error Could not read data from the virtual disk ?