The volume for a file has been externally altered.

[Ahmed Waheed]

I ran a backup task for 3 hyper-v Vms and it failed more than one time due to this mentioned error , although i ran a backup task for others VMs on the same VHDX and it successfully done ..
so , i need to know how to fix this issue .

9/26/2017 8:09:28 AM :: Processing tri-ra-10.kdmhotelinvestments.com Error: The volume for a file has been externally altered so that the opened file is no longer valid.
Failed to read data from the file [\\CTDCSSFS001\7KSSDTIER_01@{6E51BD8A-8A83-4925-856C-4E11C603F4CB}\DATA\Hyper-V\Virtual Hard Disks\TRISTAR\tri-ra-10.kdmhotelinvestments.com_e.vhdx].
Failed to upload disk.
Agent failed to process method {DataTransfer.SyncDisk}.
Exception from server: The volume for a file has been externally altered so that the opened file is no longer available .

Case ID : 02311833

[foggy]

Hi Ahmed, please continue working with our support on this issue, since deep log analysis is required here.

[Ahmed Waheed]

I am still waiting any feed back from support , as we don't know what makes Veeam while taking snapshot terminated or altered the volume .

[changeupcharley]

What's poppin y'all, has there been any update to this problem? I Just encountered it with the following:

- Hyper-V 2016, using CSV for VM storage
- Veeam Free Edition, v9u3
- VHDX files being backed up

- Trigger: I drain-paused the host that the VMs were living on during the time of the backup

Hopefully this is some helpful information for you guys.

[Mike Resseler]

With the OP it had to do with latency issues on their hardware. But I think it will be another issue in your case. Since you did a drain-paused during the backup it might be interesting that you contact support. I doubt there will be corruption or something, but it just seems not right that strange things happened while you did that drain