CIFS backup to NAS over OpenVPN hangs up

[kenaddams42]

Hi All !

I've just configured a new Proxmox installation -7.4.16) and tried to configure the backups.
I've mounted a CIFS share hosted on my NAS over an OpenVpn tunnel. Tunnel is stable, CIFS share is created properly.
However when trying to backup VMs, it works... files are transferred to the NAS but the backup process hangs up and never ends.

Here is the full process.


1- Output from pvesm status looks like this at boot:

root@hz-pve /home/xxx # pvesm status
Name                  Type     Status           Total            Used       Available        %
backup-nas            cifs     active      7496800668      3578327288      3918473380   47.73%
backup-nas-dir         dir     active      7496800668      3578327288      3918473380   47.73%
local                  dir     active       457073232        61355028       372426696   13.42%
thpl               lvmthin     active       966369280               0       966369280    0.00%

I can see the content on my backup folder hosted on my NAS:


2- Then i run a backup:

3- A backup file is stored on my NAS:


4- But this is when the CIFS share becomes unesponsive:



5 Output of /var/log/messages:

Aug 12 15:41:30 hz-pve pvedaemon[1364]: <root@pam> starting task UPID:hz-pve:00000978:0000700C:64D78C0A:vzdump:102:root@pam:
Aug 12 15:41:30 hz-pve pvedaemon[2424]: INFO: starting new backup job: vzdump 102 --storage backup-nas-dir --notes-template '{{guestname}}_{{node}}_{{vmid}}' --mode snapshot --node hz-pve --compress zstd --remove 0
Aug 12 15:41:30 hz-pve pvedaemon[2424]: INFO: Starting Backup of VM 102 (qemu)
Aug 12 15:41:33 hz-pve pvedaemon[2424]: VM 102 qmp command failed - VM 102 qmp command 'guest-ping' failed - got timeout
Aug 12 15:42:31 hz-pve pvestatd[1348]: got timeout
Aug 12 15:43:02 hz-pve pvestatd[1348]: got timeout
Aug 12 15:43:09 hz-pve pvestatd[1348]: unable to activate storage 'backup-nas-dir' - directory '/mnt/pve/backup-nas/Proxmox/PVE-HZ' does not exist or is unreachable
Aug 12 15:43:09 hz-pve pvestatd[1348]: status update time (87.424 seconds)
Aug 12 15:43:11 hz-pve pvestatd[1348]: got timeout
Aug 12 15:43:17 hz-pve pvestatd[1348]: unable to activate storage 'backup-nas' - directory '/mnt/pve/backup-nas' does not exist or is unreachable
Aug 12 15:43:41 hz-pve pvestatd[1348]: got timeout
Aug 12 15:43:48 hz-pve pvestatd[1348]: unable to activate storage 'backup-nas-dir' - directory '/mnt/pve/backup-nas/Proxmox/PVE-HZ' does not exist or is unreachable
Aug 12 15:43:48 hz-pve pvestatd[1348]: status update time (39.397 seconds)
Aug 12 15:44:09 hz-pve pvestatd[1348]: got timeout

6- Output of /var/log/messages on my NAS

2023-08-12T15:11:02+02:00 XXX_NAS smbd[20499]: ../../source3/lib/recvfile.c:237 syno_recv_file failed(-1): Broken pipe, count=[4194304] total tx/tx=[991840/991840] rwbytes=[8800/8800]
2023-08-12T15:35:35+02:00 XXX_NAS smbd[17392]: ../../source3/lib/recvfile.c:237 syno_recv_file failed(-1): Broken pipe, count=[4194304] total tx/tx=[3426600/3426600] rwbytes=[18728/18728]

I've tried to backup the same VM to a local storage folder, and it works.

Any idea ?

Thanks !

 

[kenaddams42]

Hi !
Just FYI, same problem with a NFS mount. I've tried to backup a small VM over VPN+NFS. The backup works but the task never ends.
With a backup done on a local folder, it says "TASK OK" at the end.
Any idea ?
Thanks !

 

[kenaddams42]

Ok - disregard. Seems like after one hour I finally got a "TASK OK" message. I don't know why it took so many time.