Disk space usage seems incorrect on external disk

[d19dotca]

@girish - I noticed you marked this as Solved 4 days ago, but I don't believe this has actually been solved.

There's a pretty large discrepancy in usage for my external disk as seen in earlier screenshots, and I don't see that having been resolved yet.

For example, "used" under the "this disk contains:" section is 204 GB, but then the graph part shows 217 GB used. Seems like a defect that there's multiple different "used" numbers presented, and by quite a few GBs too (approximately 5 - 20 GB discrepancy).

Even in your own screenshot from earlier, the total underneath the graph adds up to about 36 GB but yet above the graph it shows 41 GB used (this is the minimum difference I've seen so far but still a large 5 GB difference in used space).

[jdaviescoates]

@d19dotca said in Disk space usage seems incorrect on external disk:

@girish - I noticed you marked this as Solved 4 days ago, but I don't believe this has actually been solved.

Also:

it'd be nice if the GUI showed free space too in an easy manner instead of having us do the math ourselves

[girish]

@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.

[jdaviescoates]

@girish are you going to add the space available?!?!

[girish]

@jdaviescoates yes, your message has been relayed to @nebulon

[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.