reboot one node case all other nodes backup stop

Hi,
in daily backup we did reboot to one of the servers
in case of that reboot, all other nodes stop the backup proccess
example:

Code:

INFO: Starting Backup of VM 117 (lxc)
INFO: status = running
ERROR: Backup of VM 117 failed - unable to open file '/etc/pve/nodes/server13nvme/lxc/117.conf.tmp.7676' - Permission denied

syggestions?

Regards,

 

Hi,
1. yes, it's member of a cluster

2. after the reboot the node lost the quorum, after I rebooted all the nodes the quorum back to normal, it's look like the combination of backup and lost node from the cluster together Disrupted the work of the cluster

 

yes,
we have total of 2 networks
1. Internet

2. internal network for Backups and cluster

 

any suggestion how to mange it with 2 network interfaces?
maybe vlans will help here?
openvswitch?

 

Thanks!
about: maybe vlans will help here?
we using 2x Broadcom BCM56846 10GbE Low Latency Switch
it's can work?

Regards,