Proxmox vzdump do not end IF backup in suspend or stop mode

[Berger]

Hello, I have last version Proxmox 6.x (now 6,2) and VM backup to Windows Server 2008 disks (CIFS) in the same network (LAN 1Gb) .
If run backup task task for snapshot the job ends OK

Proxmox
Virtual Environment 6.2-6
Virtual Machine 100 (TNT) on node 'proxmox'
Filter VMID
Logs
()
INFO: starting new backup job: vzdump 100 --node proxmox --compress zstd --mode snapshot --storage MDServer --remove 0
INFO: Starting Backup of VM 100 (qemu)
INFO: Backup started at 2020-06-30 20:23:49
INFO: status = running
INFO: VM Name: TNT
INFO: include disk 'scsi0' 'localRAID1:vm-100-disk-0' 100G
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: creating archive '/mnt/pve/MDServer/dump/vzdump-qemu-100-2020_06_30-20_23_49.vma.zst'
INFO: started backup task '9c170b5a-2000-4637-b62b-2d359be85fd5'
INFO: resuming VM again
INFO: status: 0% (475136000/107374182400), sparse 0% (128724992), duration 3, read/write 158/115 MB/s
INFO: status: 1% (1090912256/107374182400), sparse 0% (181481472), duration 11, read/write 76/70 MB/s
INFO: status: 2% (2147614720/107374182400), sparse 0% (196046848), duration 32, read/write 50/49 MB/s
INFO: status: 3% (3257532416/107374182400), sparse 0% (279232512), duration 45, read/write 85/78 MB/s
INFO: status: 4% (4492886016/107374182400), sparse 0% (604082176), duration 56, read/write 112/82 MB/s
INFO: status: 5% (5393743872/107374182400), sparse 0% (647987200), duration 65, read/write 100/95 MB/s
..
INFO: status: 97% (104153612288/107374182400), sparse 12% (13615497216), duration 1383, read/write 141/126 MB/s
INFO: status: 98% (105385164800/107374182400), sparse 13% (13993218048), duration 1393, read/write 123/85 MB/s
INFO: status: 99% (106411458560/107374182400), sparse 13% (14136856576), duration 1403, read/write 102/88 MB/s
INFO: status: 100% (107374182400/107374182400), sparse 13% (14973509632), duration 1408, read/write 192/25 MB/s
INFO: transferred 107374 MB in 1408 seconds (76 MB/s)
INFO: archive file size: 47.00GB
INFO: Finished Backup of VM 100 (00:23:28)
INFO: Backup finished at 2020-06-30 20:47:17
INFO: Backup job finished successfully
TASK OK

If run backup task as suspend mode or stop mode

INFO: status: 100% (107374182400/107374182400), sparse 13% (14973509632), duration 1408, read/write 192/25 MB/s
INFO: transferred 107374 MB in 1408 seconds (76 MB/s)

backup task it never ends and the VM is blocked

Last year it worked, then after some upgrade of proxmox or windows server 2008R2 this problem occurred and I don't know what to do with it.
Can you advise?

 

[Dominic]

Do you use Qemu Guest Agent for the Windows VM? Does this problem happen with any other VM?