Convoy-gluster file changed as we read it

I have 3 hosts.installed gluster-fs and convoy-gluster from catalog.
I modified my_vol types, from reply to Distribute (/opt/rancher/ num 58: gluster volume create $ {VOLUME_NAME} transport tcp $ {CONTAINER_MNTS})
I created a volume from UI named pools_1 and mount it to a container(volumes is pools_1:/tmp1).
but docker-enter in container,cd /tmp1.When I run the command: tar zcvf openvpn-2.3.10.tar.gz ./openvpn-2.3.10, display an error: file changed as we read it
If my_vol mount the hard disk directory, without Convoy-gluster, there is no mistake