Disk space usage seems incorrect on external disk

[jdaviescoates]

@girish @nebulon thanks!

[nebulon]

The remaining available disk space is now displayed in the remainder section of the bar.

[robi]

@nebulon what happens if it fills up and shrinks the available space to print the numbers?

[d19dotca]

@girish said in Disk space usage seems incorrect on external disk:

@d19dotca Can you give us the output of df -B1 --output=source,fstype,size,used,avail,pcent,target ? This is the command used to get disk information.

The du information is got from the du command. Can you check if running du -DsB1 <path> matches with what you see in graph for the apps and backup directory ?

Finally, for docker itself, the size comes from docker system df output.

Hi Girish. Happy to help here. I ran the commands as requested.

The output for that df command is below (my backup disk is currently full, need to expand that in a minute, haha):

ubuntu@my:~$ df -B1 --output=source,fstype,size,used,avail,pcent,target
Filesystem     Type        1B-blocks         Used       Avail Use% Mounted on
udev           devtmpfs   4125618176            0  4125618176   0% /dev
tmpfs          tmpfs       834379776      6078464   828301312   1% /run
/dev/vda1      ext4     181372190720  99085045760 72606834688  58% /
tmpfs          tmpfs      4171890688            0  4171890688   0% /dev/shm
tmpfs          tmpfs         5242880            0     5242880   0% /run/lock
tmpfs          tmpfs      4171890688            0  4171890688   0% /sys/fs/cgroup
/dev/vdb1      ext4     252515119104 252498403328           0 100% /mnt/cloudronbackup
/dev/loop1     squashfs     58327040     58327040           0 100% /snap/core18/2560
/dev/loop2     squashfs     66322432     66322432           0 100% /snap/core20/1623
/dev/loop4     squashfs     50331648     50331648           0 100% /snap/snapd/17336
/dev/loop0     squashfs     58327040     58327040           0 100% /snap/core18/2566
/dev/loop3     squashfs     50331648     50331648           0 100% /snap/snapd/17029
/dev/loop6     squashfs     71303168     71303168           0 100% /snap/lxd/22526
/dev/loop5     squashfs     71172096     71172096           0 100% /snap/lxd/22753
/dev/loop7     squashfs     65011712     65011712           0 100% /snap/core20/1611
tmpfs          tmpfs       834375680            0   834375680   0% /run/user/1000

This seems to show an issue... if I'm understanding the output correctly, this means that I have a /dev/vda1 (root) disk size of about 181 GB with about 99 GB used, yet it's showing 108.77 GB used in the UI (screenshot included):

Hopefully that clarifies the issue a bit by showing the discrepancies between what's shown in the UI vs what's shown in the command line terminal on the VM.

The du command output is below:

ubuntu@my:~$ sudo du -DsB1 /home/yellowtent/platformdata/
9498304512	/home/yellowtent/platformdata/
ubuntu@my:~$ sudo du -DsB1 /home/yellowtent/boxdata/
46611869696	/home/yellowtent/boxdata/

Based on that output and my UI, I believe the values of each item beneath the graphs are correct, but the total numbers calculated at the top (above the graph) are incorrect, or at least the above-graph used space number seems to be incorrect.

The other docker command output is below:

ubuntu@my:~$ sudo docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          29        21        15.58GB   6.058GB (38%)
Containers      94        70        0B        0B
Local Volumes   606       138       1.559GB   1.02GB (65%)
Build Cache     0         0         0B        0B

[nebulon]

@robi currently it will just hide it, if it overflows. I think in such a case one should anyways take a closer look.

[nebulon]

@d19dotca actually I think we need a more direct look at your system to figure out what is happening there. If you like, can you enable remote SSh support for us and send us a mail with your dashboard domain to support@cloudron.io ?

[d19dotca]

@nebulon No problem at all. I just enabled access for you and submitted the ticket for it through the Support page in Cloudron. Hope that helps.

[nebulon]

@d19dotca so the root cause for the discrepancy is the reserved disk space for the root user on ext4. Some info on that at https://wiki.archlinux.org/title/ext4#Reserved_blocks

This is also why df shows a discrepancy between the values. I have fixed up the UI now to reflect exactly what df reports to avoid confusion.

[d19dotca]

@nebulon just to clarify, by “ext4” are we referring to my use of that for the backup type where I did the ext4 option with the “by-uuid” loading? Or is that related to something else? Just wanting to better understand it. Regardless though, thanks for fixing it!

[nebulon]

@d19dotca ext4 is the filesystem type in this case from your root / partition and ext4 has a feature of reserved blocks for the root user. Other disks may or may not be ext4 like for volumes or backup.