Hi, PVE 7.0-13, when i backup vm on nfs i get error:
INFO: starting new backup job: vzdump 109 --storage syn --node srv --remove 0 --compress zstd --mode snapshot
INFO: Starting Backup of VM 109 (qemu)
INFO: Backup started at 2021-10-15 20:28:46
INFO: status = running
INFO: VM Name: proxy
INFO: include disk 'scsi0' 'local:109/vm-109-disk-0.qcow2' 20G
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: creating vzdump archive '/mnt/pve/syn/dump/vzdump-qemu-109-2021_10_15-20_28_46.vma.zst'
INFO: issuing guest-agent 'fs-freeze' command
INFO: issuing guest-agent 'fs-thaw' command
INFO: started backup task '82295a0f-da21-4197-88b3-a95d3e84ce6b'
INFO: resuming VM again
INFO: 3% (652.5 MiB of 20.0 GiB) in 3s, read: 217.5 MiB/s, write: 155.0 MiB/s
INFO: 6% (1.3 GiB of 20.0 GiB) in 6s, read: 219.9 MiB/s, write: 135.9 MiB/s
INFO: 8% (1.7 GiB of 20.0 GiB) in 9s, read: 133.7 MiB/s, write: 129.4 MiB/s
INFO: 10% (2.2 GiB of 20.0 GiB) in 12s, read: 166.0 MiB/s, write: 126.7 MiB/s
INFO: 13% (2.7 GiB of 20.0 GiB) in 15s, read: 175.2 MiB/s, write: 121.0 MiB/s
INFO: 26% (5.2 GiB of 20.0 GiB) in 18s, read: 865.4 MiB/s, write: 105.2 MiB/s
INFO: 28% (5.6 GiB of 20.0 GiB) in 21s, read: 135.1 MiB/s, write: 130.9 MiB/s
INFO: 30% (6.0 GiB of 20.0 GiB) in 24s, read: 143.8 MiB/s, write: 130.9 MiB/s
INFO: 32% (6.4 GiB of 20.0 GiB) in 27s, read: 128.1 MiB/s, write: 125.5 MiB/s
INFO: 34% (6.8 GiB of 20.0 GiB) in 30s, read: 136.5 MiB/s, write: 135.9 MiB/s
INFO: 36% (7.3 GiB of 20.0 GiB) in 33s, read: 172.8 MiB/s, write: 135.4 MiB/s
INFO: 38% (7.7 GiB of 20.0 GiB) in 36s, read: 142.6 MiB/s, write: 130.7 MiB/s
INFO: 40% (8.2 GiB of 20.0 GiB) in 39s, read: 161.9 MiB/s, write: 119.7 MiB/s
INFO: 43% (8.6 GiB of 20.0 GiB) in 42s, read: 146.2 MiB/s, write: 142.4 MiB/s
INFO: 45% (9.0 GiB of 20.0 GiB) in 45s, read: 128.1 MiB/s, write: 125.8 MiB/s
INFO: 47% (9.5 GiB of 20.0 GiB) in 48s, read: 172.8 MiB/s, write: 141.9 MiB/s
INFO: 49% (9.9 GiB of 20.0 GiB) in 51s, read: 147.2 MiB/s, write: 142.6 MiB/s
INFO: 51% (10.4 GiB of 20.0 GiB) in 54s, read: 145.2 MiB/s, write: 134.4 MiB/s
INFO: 53% (10.8 GiB of 20.0 GiB) in 57s, read: 135.2 MiB/s, write: 131.9 MiB/s
INFO: 56% (11.3 GiB of 20.0 GiB) in 1m, read: 175.8 MiB/s, write: 147.6 MiB/s
INFO: 58% (11.7 GiB of 20.0 GiB) in 1m 3s, read: 133.7 MiB/s, write: 132.9 MiB/s
INFO: 60% (12.2 GiB of 20.0 GiB) in 1m 6s, read: 166.8 MiB/s, write: 149.4 MiB/s
INFO: 62% (12.6 GiB of 20.0 GiB) in 1m 9s, read: 135.3 MiB/s, write: 133.1 MiB/s
INFO: 64% (13.0 GiB of 20.0 GiB) in 1m 12s, read: 151.4 MiB/s, write: 133.0 MiB/s
INFO: 67% (13.5 GiB of 20.0 GiB) in 1m 15s, read: 179.7 MiB/s, write: 145.2 MiB/s
INFO: 69% (13.9 GiB of 20.0 GiB) in 1m 18s, read: 129.3 MiB/s, write: 126.0 MiB/s
INFO: 71% (14.4 GiB of 20.0 GiB) in 1m 21s, read: 155.9 MiB/s, write: 150.4 MiB/s
INFO: 73% (14.8 GiB of 20.0 GiB) in 1m 24s, read: 139.0 MiB/s, write: 135.3 MiB/s
INFO: 80% (16.1 GiB of 20.0 GiB) in 1m 27s, read: 464.0 MiB/s, write: 144.0 MiB/s
INFO: 89% (18.0 GiB of 20.0 GiB) in 1m 30s, read: 638.0 MiB/s, write: 72.0 MiB/s
INFO: 100% (20.0 GiB of 20.0 GiB) in 1m 31s, read: 2.0 GiB/s, write: 16.0 KiB/s
INFO: backup is sparse: 8.37 GiB (41%) total zero data
INFO: transferred 20.00 GiB in 91 seconds (225.1 MiB/s)
Warning: unable to close filehandle GEN5371 properly: Input/output error at /usr/share/perl5/PVE/VZDump/QemuServer.pm line 764.
zstd: /*stdout*\: Input/output error
ERROR: Backup of VM 109 failed - zstd --rsyncable --threads=1 failed - wrong exit status 1
INFO: Failed at 2021-10-15 20:33:19
INFO: Backup job finished with errors
TASK ERROR: job errors
INFO: starting new backup job: vzdump 109 --storage syn --node srv --remove 0 --compress zstd --mode snapshot
INFO: Starting Backup of VM 109 (qemu)
INFO: Backup started at 2021-10-15 20:28:46
INFO: status = running
INFO: VM Name: proxy
INFO: include disk 'scsi0' 'local:109/vm-109-disk-0.qcow2' 20G
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: creating vzdump archive '/mnt/pve/syn/dump/vzdump-qemu-109-2021_10_15-20_28_46.vma.zst'
INFO: issuing guest-agent 'fs-freeze' command
INFO: issuing guest-agent 'fs-thaw' command
INFO: started backup task '82295a0f-da21-4197-88b3-a95d3e84ce6b'
INFO: resuming VM again
INFO: 3% (652.5 MiB of 20.0 GiB) in 3s, read: 217.5 MiB/s, write: 155.0 MiB/s
INFO: 6% (1.3 GiB of 20.0 GiB) in 6s, read: 219.9 MiB/s, write: 135.9 MiB/s
INFO: 8% (1.7 GiB of 20.0 GiB) in 9s, read: 133.7 MiB/s, write: 129.4 MiB/s
INFO: 10% (2.2 GiB of 20.0 GiB) in 12s, read: 166.0 MiB/s, write: 126.7 MiB/s
INFO: 13% (2.7 GiB of 20.0 GiB) in 15s, read: 175.2 MiB/s, write: 121.0 MiB/s
INFO: 26% (5.2 GiB of 20.0 GiB) in 18s, read: 865.4 MiB/s, write: 105.2 MiB/s
INFO: 28% (5.6 GiB of 20.0 GiB) in 21s, read: 135.1 MiB/s, write: 130.9 MiB/s
INFO: 30% (6.0 GiB of 20.0 GiB) in 24s, read: 143.8 MiB/s, write: 130.9 MiB/s
INFO: 32% (6.4 GiB of 20.0 GiB) in 27s, read: 128.1 MiB/s, write: 125.5 MiB/s
INFO: 34% (6.8 GiB of 20.0 GiB) in 30s, read: 136.5 MiB/s, write: 135.9 MiB/s
INFO: 36% (7.3 GiB of 20.0 GiB) in 33s, read: 172.8 MiB/s, write: 135.4 MiB/s
INFO: 38% (7.7 GiB of 20.0 GiB) in 36s, read: 142.6 MiB/s, write: 130.7 MiB/s
INFO: 40% (8.2 GiB of 20.0 GiB) in 39s, read: 161.9 MiB/s, write: 119.7 MiB/s
INFO: 43% (8.6 GiB of 20.0 GiB) in 42s, read: 146.2 MiB/s, write: 142.4 MiB/s
INFO: 45% (9.0 GiB of 20.0 GiB) in 45s, read: 128.1 MiB/s, write: 125.8 MiB/s
INFO: 47% (9.5 GiB of 20.0 GiB) in 48s, read: 172.8 MiB/s, write: 141.9 MiB/s
INFO: 49% (9.9 GiB of 20.0 GiB) in 51s, read: 147.2 MiB/s, write: 142.6 MiB/s
INFO: 51% (10.4 GiB of 20.0 GiB) in 54s, read: 145.2 MiB/s, write: 134.4 MiB/s
INFO: 53% (10.8 GiB of 20.0 GiB) in 57s, read: 135.2 MiB/s, write: 131.9 MiB/s
INFO: 56% (11.3 GiB of 20.0 GiB) in 1m, read: 175.8 MiB/s, write: 147.6 MiB/s
INFO: 58% (11.7 GiB of 20.0 GiB) in 1m 3s, read: 133.7 MiB/s, write: 132.9 MiB/s
INFO: 60% (12.2 GiB of 20.0 GiB) in 1m 6s, read: 166.8 MiB/s, write: 149.4 MiB/s
INFO: 62% (12.6 GiB of 20.0 GiB) in 1m 9s, read: 135.3 MiB/s, write: 133.1 MiB/s
INFO: 64% (13.0 GiB of 20.0 GiB) in 1m 12s, read: 151.4 MiB/s, write: 133.0 MiB/s
INFO: 67% (13.5 GiB of 20.0 GiB) in 1m 15s, read: 179.7 MiB/s, write: 145.2 MiB/s
INFO: 69% (13.9 GiB of 20.0 GiB) in 1m 18s, read: 129.3 MiB/s, write: 126.0 MiB/s
INFO: 71% (14.4 GiB of 20.0 GiB) in 1m 21s, read: 155.9 MiB/s, write: 150.4 MiB/s
INFO: 73% (14.8 GiB of 20.0 GiB) in 1m 24s, read: 139.0 MiB/s, write: 135.3 MiB/s
INFO: 80% (16.1 GiB of 20.0 GiB) in 1m 27s, read: 464.0 MiB/s, write: 144.0 MiB/s
INFO: 89% (18.0 GiB of 20.0 GiB) in 1m 30s, read: 638.0 MiB/s, write: 72.0 MiB/s
INFO: 100% (20.0 GiB of 20.0 GiB) in 1m 31s, read: 2.0 GiB/s, write: 16.0 KiB/s
INFO: backup is sparse: 8.37 GiB (41%) total zero data
INFO: transferred 20.00 GiB in 91 seconds (225.1 MiB/s)
Warning: unable to close filehandle GEN5371 properly: Input/output error at /usr/share/perl5/PVE/VZDump/QemuServer.pm line 764.
zstd: /*stdout*\: Input/output error
ERROR: Backup of VM 109 failed - zstd --rsyncable --threads=1 failed - wrong exit status 1
INFO: Failed at 2021-10-15 20:33:19
INFO: Backup job finished with errors
TASK ERROR: job errors