Storage volume is not showing in container after some time, while executing df -h command

1

Hi,
Created storage volume and assign to container, at the first time volume is shown in container(df -h command),After try to put data in volume it is not showing inside container while executing df -h command ,but it is their location(/dev/nifi) and files also available.
1)
root@nifi-2:/dev/nifi# df -h
Filesystem Size Used Avail Use% Mounted on
disk/containers/nifi-2 21G 1.9G 19G 10% /
none 492K 8.0K 484K 2% /dev
udev 95G 0 95G 0% /dev/tty
tmpfs 100K 0 100K 0% /dev/lxd
tmpfs 100K 0 100K 0% /dev/.lxd-mounts
tmpfs 95G 0 95G 0% /dev/shm
tmpfs 19G 204K 19G 1% /run
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 95G 0 95G 0% /sys/fs/cgroup
disk/custom/default_nifi-storage-2 168G 128K 168G 1% /dev/nifi

2)root@nifi-2:/dev/nifi# df -h
Filesystem Size Used Avail Use% Mounted on
disk/containers/nifi-2 22G 4.9G 17G 23% /
none 492K 16K 476K 4% /dev
udev 95G 0 95G 0% /dev/tty
tmpfs 100K 0 100K 0% /dev/lxd
tmpfs 100K 0 100K 0% /dev/.lxd-mounts
tmpfs 95G 0 95G 0% /dev/shm
tmpfs 19G 184K 19G 1% /run
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 95G 0 95G 0% /sys/fs/cgroup

point:2 it is not showing volume , while executing df -h command. we can write data to storage volume? if we written data into that storage volume will loss data??

2

volume is available in container but it is not showing, is it have any problem
root@nifi-2:/opt/nifi-1.12.1# cd /dev/nifi/
root@nifi-2:/dev/nifi# ls
nifi-storage

3

Does df -a show it?

4

Same issue have two different containers.
second container it is showing after executing df -a.but first container it is not showing

second container:
root@nifi-2:/dev/nifi# df -a
Filesystem 1K-blocks Used Available Use% Mounted on
disk2/containers/nifi-2 22683904 5049344 17634560 23% /
tmpfs 100 0 100 0% /dev/lxd
disk/custom/default_nifi-storage-2 175781248 2048 175779200 1% /dev/nifi

first container:
root@nifi-1:/dev/nifi# df -a
Filesystem 1K-blocks Used Available Use% Mounted on
disk2/containers/nifi-1 22683904 4966656 17717248 22% /

5

Look for it in /proc/mounts, if it’s not in there, then something unmounted it.

6

but it is showing while executing below commands,Data also their

root@nifi-1:/dev# cd /dev
root@nifi-1:/dev# cd nifi/
root@nifi-1:/dev/nifi# ls
nifi-storage
root@nifi-1:/dev/nifi#

but unable readwrite files…
Try to execute attach storage volume command it is showing already device exists.
So, now i attach storage volume with another device for same container