[PVE-User] LXC Containers freezing during backup (snapshot)

[Marc]

Hello,

I recently switched to PVE 4.1 with containers using LXC instead OpenVZ.

I'm using ZFS for container storage. I scheduled the backup using 
snapshot every night.

Sometimes the backup freezes on the command "lxc-freeze" during snapshot 
storage creation and the container
stay freezed for hours until I kill manually lxc-freeze and launch 
lxc-unfreeze on the container.

I also noticed the same problem on LXC Container on LVM storage where 
snapshot isn't available and use suspend for backup.

Did someone encountered the same problem? Any hint on how to solve this?

Thank you,

Marc