[SOLVED] - Chunks permission error affecting only one specific vm backup

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invalid@exam · 2026-06-27 · via Proxmox Support Forum

INFO: starting new backup job: vzdump 401 --remove 0 --mode snapshot --notes-template '{{guestname}}' --notification-mode auto --storage pbs-unraid-vm --node apollo
INFO: Starting Backup of VM 401 (qemu)
INFO: Backup started at 2024-01-09 12:01:39
INFO: status = stopped
INFO: backup mode: stop
INFO: ionice priority: 7
INFO: VM Name: win11
INFO: include disk 'virtio0' 'local:401/vm-401-disk-2.raw' 128G
INFO: include disk 'efidisk0' 'local:401/vm-401-disk-0.qcow2' 528K
INFO: include disk 'tpmstate0' 'local:401/vm-401-disk-1.raw' 17K
INFO: creating Proxmox Backup Server archive 'vm/401/2024-01-09T11:01:39Z'
INFO: starting kvm to execute backup task
swtpm_setup: Not overwriting existing state file.
INFO: attaching TPM drive to QEMU for backup
INFO: started backup task '0df4517d-9e4a-4541-8de9-d82c703032de'
INFO: efidisk0: dirty-bitmap status: created new
INFO: tpmstate0-backup: dirty-bitmap status: created new
INFO: virtio0: dirty-bitmap status: created new
INFO:   0% (568.0 MiB of 128.0 GiB) in 3s, read: 189.3 MiB/s, write: 165.3 MiB/s
INFO:   1% (1.4 GiB of 128.0 GiB) in 7s, read: 216.0 MiB/s, write: 215.0 MiB/s
INFO:   2% (2.7 GiB of 128.0 GiB) in 13s, read: 216.0 MiB/s, write: 216.0 MiB/s
INFO:   3% (3.9 GiB of 128.0 GiB) in 18s, read: 249.6 MiB/s, write: 248.0 MiB/s
INFO:   4% (5.3 GiB of 128.0 GiB) in 25s, read: 205.1 MiB/s, write: 202.9 MiB/s
INFO:   5% (6.5 GiB of 128.0 GiB) in 31s, read: 210.7 MiB/s, write: 210.7 MiB/s
INFO:   6% (7.7 GiB of 128.0 GiB) in 37s, read: 200.7 MiB/s, write: 198.7 MiB/s
INFO:   7% (9.1 GiB of 128.0 GiB) in 45s, read: 179.0 MiB/s, write: 178.0 MiB/s
INFO:   8% (10.3 GiB of 128.0 GiB) in 50s, read: 254.4 MiB/s, write: 249.6 MiB/s
INFO:   9% (11.6 GiB of 128.0 GiB) in 53s, read: 444.0 MiB/s, write: 438.7 MiB/s
INFO:  10% (12.8 GiB of 128.0 GiB) in 59s, read: 200.7 MiB/s, write: 194.0 MiB/s
INFO:  11% (14.4 GiB of 128.0 GiB) in 1m 8s, read: 182.2 MiB/s, write: 177.8 MiB/s
INFO:  12% (15.6 GiB of 128.0 GiB) in 1m 15s, read: 167.4 MiB/s, write: 165.7 MiB/s
INFO:  12% (15.8 GiB of 128.0 GiB) in 1m 16s, read: 220.0 MiB/s, write: 220.0 MiB/s
ERROR: backup write data failed: command error: write_data upload error: pipelined request failed: inserting chunk on store 'pbs-backup' failed for 4437faf5b38d38db305ddcca6306cdfd4f71d0ddc85c00f467048649eadeec12 - mkstemp "/mnt/pbs-backup/.chunks/4437/4437faf5b38d38db305ddcca6306cdfd4f71d0ddc85c00f467048649eadeec12.tmp_XXXXXX" failed: EACCES: Permission denied
INFO: aborting backup job
INFO: stopping kvm after backup task
trying to acquire lock...
 OK
ERROR: Backup of VM 401 failed - backup write data failed: command error: write_data upload error: pipelined request failed: inserting chunk on store 'pbs-backup' failed for 4437faf5b38d38db305ddcca6306cdfd4f71d0ddc85c00f467048649eadeec12 - mkstemp "/mnt/pbs-backup/.chunks/4437/4437faf5b38d38db305ddcca6306cdfd4f71d0ddc85c00f467048649eadeec12.tmp_XXXXXX" failed: EACCES: Permission denied
INFO: Failed at 2024-01-09 12:02:57
INFO: Backup job finished with errors

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