Linux backup fail

Hi,

please check if you are using pass-through disks, there are known limitations for Hyper-V:

Microsoft Hyper-V does not provide control over pass-through disks to a host system. As a result, the Microsoft Software Shadow Copy provider cannot provide Agent for Hyper-V with snapshots of pass-through disks.

You can also try to install the Agent in your guest OS as mentioned in Backing up pass-through disks. 

I'm not using pass-through disks.

The "Microsoft Hyper-V VSS Writer" should be listed when executing command "vssadmin list writers" and should be in error-free state.

There is also a message Attempt to access emulated disk for non-initialized object in your log. Maybe the VSS writer cannot reserve space for snapshot operation, this can be caused when your VMs haven't enough free diskspace or the virtual filesystem is not recognized by Hyper-V.

You can try to disable Multi-Volume-Snapshots and VSS in backup plan options.

Is the Linux Integration package installed in guest OS?

Thanks for quick response.

I've checked all servers and for "Microsoft Hyper-V VSS Writer" all are in state: Stable , after backup windows VM there is no error.

When I backup Linux VM State: (8) Failed
Last error: Non-retryable error
After restarting the "Hyper-V Virtual Machine Management" service state is with no error.

All VM disk ared dynamic .vhdx and there is space.
All Backup options are on default
I've also tried to disable Multi-Volume-Snapshots, change the VSS snapshot provider, and no change.

One more thing is that when I start backup operatnion (with Linux VM which it cannot backup) in Acronis Backup (11.7) it is standing at 21% and when I canncel it nothing happens.

Have you tried to install the Backup Agent in the Guest OS and let it create snapshots from "inside" instead of agentless from "outside".

According to Microsoft Technet article Supported Ubuntu virtual machines on Hyper-V you have to install the VSS daemon separately in LTS versions and you should install the latest HWE kernel (see Note 5 in the linked article).

I seem to be having this exact same issue, specifically trying to backup an OpenVPN Access Server VM shown here which uses Linux:
https://openvpn.net/index.php/access-server/download-openvpn-as-vm/202…

Were you able to resolve your issue?

hi,

I've resolve my issue by giving VM folder acronis agent acces rights as descriped here:

https://forum.acronis.com/forum/30552

hope it help you too.

Thanks so much for the reply.

In my case only the Linux VM backup fails, other VMs on the server backup without issue.

I see the post in your link saying "i solved this problem by giving the backup destination folder/partition access rights for acronis agent".

If you have a moment could you go into more detail about what you did to resolve your issue?  Want to make sure I understand correctly.

Thank you.

I have server on windows server (vm with linux are under hyper-v) so I needed to gave the folder sercurity read/access (with VM vhd snapshot and all) in windows too acronis agent user.

Thank you.  Was this the backup destination folder, or the folder that holds your VHDX files?

Thank you so much.

folder that holds all VM files (snapshot, checkpoint, vhd, vhdx)

I have given read/write/modify access to the Acronis Agent User for these folders:

C:\ProgramData\Microsoft\Windows\Hyper-V
D:\Virtual Machines (which holds my VHDX files)

..but unfortunately this did not resolve my issue.  The job backing up my Linux VM is still hanging at 21%, and will eventually error out I'm sure.

:(

only D:\Virtual Machines with inherit on to all folder/files will be enough.
just to be sure add also Acronis Remote User.

You should also check in your Linux VM that you have all services to backup installed for hyper-v to be able to backup.

I don't know the detalis so you need to ask acronis.

Good luck.

Thanks