I don't understand shares. Copying /mnt/user/appdata to same location fills rootfs on /

[Whiskeyjack]

I thought I was getting a good grasp of how this all works, but now I'm stumped. My assumption was that everything in /mnt/user/appdata is actually on /mnt/cache_appdata (my cache pool, configuration below).

 

However, when I was making a backup, in this case my Jellyfin appdata:

cp -rp /mnt/user/appdata/jellyfin /mnt/user/appdata/jellyfin_1.7

 

My below 24G "rootfs" continually filled up until the unRAID WebUI died.

 

Obviously I have something configured improperly but I'm not sure where to even begin looking.

 

I have my appdata share as such:

 

And the cache disk:

 

 

unRAID:

Filesystem      Size  Used Avail Use% Mounted on
rootfs           24G   13G   11G  56% /
devtmpfs         24G     0   24G   0% /dev
tmpfs            24G  1.2G   23G   6% /dev/shm
cgroup_root     8.0M     0  8.0M   0% /sys/fs/cgroup
tmpfs           128M   11M  118M   8% /var/log
/dev/sda1        29G  483M   29G   2% /boot
overlay          24G   13G   11G  56% /lib/modules
overlay          24G   13G   11G  56% /lib/firmware
/dev/md1        7.3T  6.6T  698G  91% /mnt/disk1
/dev/md2        7.3T  6.6T  705G  91% /mnt/disk2
/dev/md3        7.3T  6.7T  603G  92% /mnt/disk3
/dev/md4        7.3T  6.6T  700G  91% /mnt/disk4
/dev/md5        7.3T  6.6T  699G  91% /mnt/disk5
/dev/md6        7.3T  6.5T  845G  89% /mnt/disk6
/dev/md7        7.3T  6.6T  750G  90% /mnt/disk7
/dev/md8         11T  9.9T  1.1T  91% /mnt/disk8
/dev/sdf1       466G   81G  386G  18% /mnt/cache_appdata
/dev/sdd1       466G  292G  174G  63% /mnt/cache_downloads
shfs             62T   56T  6.0T  91% /mnt/user0
shfs             62T   56T  6.0T  91% /mnt/user
/dev/loop3      1.0G  4.0M  905M   1% /etc/libvirt
/dev/loop2       40G   15G   23G  40% /var/lib/docker

 

Edited January 10, 2022 by Whiskeyjack

[itimpi]

That definitely looks like it should work.   I have done similar operations myself in the past with no problems.    Are you sure you did not mistype anything in the cp command?    Remember that capitalisation is significant as Linux is case sensitive.

[Whiskeyjack]

13 hours ago, itimpi said:

That definitely looks like it should work.   I have done similar operations myself in the past with no problems.    Are you sure you did not mistype anything in the cp command?    Remember that capitalisation is significant as Linux is case sensitive.

Yep, I tried a couple times just to make sure. I'm an exclusive linux user as well, so I'm confident I can rule that out. What I'm not confident about is how the shares are set up, but nothing *looks* wrong to me.