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Igor

Backups

Local

They run to /var/lib/vz/dump which is the root volume that has 94GB in total so only keep 2 backups max.

Umma over SMB

Backups go to SMB mount at /mnt/pve/umma on Igor that mounts Igor share from Umma.

Looks like compression is not on the fly but it first dumps data uncompressed and then runs compression which fails on SMB mount... https://community.nethserver.org/t/proxmox-help-needed-proxmox-backup-ends-with-broken-pipe/18537/2

Can set where the "temp" file is created so it goes to local drive first:

/etc/vzdump.conf 
tmpdir: /var/lib/vz/dump/temp

This is not true for VM backups... I see files with .dat created during backup where size matches compressed size and "tmpdir" is not used much.

Looks like the problem is on CIFS level:

[9092263.225010] CIFS: Attempting to mount \\192.168.0.8\Igor
[9092263.385599] CIFS: VFS: parse_server_interfaces: malformed interface info
[9092318.751704] CIFS: VFS: \\192.168.0.8 Error -104 sending data on socket to server
[9092318.925726] CIFS: reconnect tcon failed rc = -11
[9092329.032446] CIFS: VFS: \\192.168.0.8 Error -32 sending data on socket to server
[9092338.103933] CIFS: VFS: \\192.168.0.8 Error -104 sending data on socket to server
[9092348.628780] CIFS: VFS: \\192.168.0.8 Error -32 sending data on socket to server
[9092358.347996] CIFS: VFS: \\192.168.0.8 Error -104 sending data on socket to server
[9092368.365350] CIFS: VFS: \\192.168.0.8 Error -32 sending data on socket to server
[9092368.367144] CIFS: VFS: \\192.168.0.8 Error -512 sending data on socket to server
[9092378.738559] CIFS: VFS: \\192.168.0.8 Error -104 sending data on socket to server
[9092379.353289] CIFS: VFS: No writable handle in writepages rc=-11
...
[9092379.387539] CIFS: VFS: No writable handle in writepages rc=-9[9092768.976150] CIFS: VFS: \\192.168.0.8 Error -32 sending data on socket to server
[9092788.488714] CIFS: VFS: \\192.168.0.8 Error -104 sending data on socket to server
[9092788.936658] CIFS: VFS: \\192.168.0.8 Error -104 sending data on socket to server
...

On Umma I have checked:

  • Disable multiple connection from the same IP address
  • Enable asynchronous read (auto select for next option)
  • Enable SMB3 Multichannel

And now I don't get parse_server_interfaces: malformed interface info and full backup worked with no errors.

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