Forum Discussion

Tutor

Feb 23, 2021

ReadyNas 628x Mysterious Storage Consumption

I have an RN628x with 8x 2TB drives in RAID6. In total I have about 10.89TB of provisioned storage. Out of the main storage I have 3 main shares. I also have 1 thick provisioned LUN. I do not utilize...

StephenB

Guru - Experienced User

Feb 23, 2021

Can you post the output of these commands?

# btrfs fi sh /data
# btrfs fi df /data

You might also find these helpful, but there is some privacy leakage, so you might not want to post them.

# btrfs subv list /data
# du -hd1 /data
# btrfs qgroup show /data

Given the overall situation, you might want to delete all the snapshots.

pwptech

Tutor

Feb 23, 2021

Thanks for the reply StephenB

I have deleted all snapshots but I'm still showing 577.04GB of snapshot data on the frontend GUI [depicted by yellow slice of pie chart]

root@NAS-01:~# btrfs fi sh /data
Label: '0a4357ec:data'  uuid: 3e5e6709-18d6-4dc0-b238-ba3e4cbaf8de
        Total devices 1 FS bytes used 10.06TiB
        devid    1 size 10.89TiB used 10.86TiB path /dev/md127

root@NAS-01:~# btrfs fi df /data
Data, single: total=10.86TiB, used=10.06TiB
System, DUP: total=32.00MiB, used=1.50MiB
Metadata, DUP: total=1.00GiB, used=429.44MiB
GlobalReserve, single: total=190.06MiB, used=0.00B

To delete all snapshots should I just delete all directories containing .snapshot as the name? When I show all snapshots under /data I only have 1 listed and it's less than 150MB.

root@NAS-01:~# btrfs subv list -s /data
ID 40579 gen 49790139 cgen 49790139 top level 6346 otime 2021-02-17 00:00:16 path MSDS/.snapshots/980/snapshot
root@NAS-01:~# du -sh /data/MSDS/.snapshots
127M /data/MSDS/.snapshots

When showing du -sh on root it shows 7.5TB in total.

root@NAS-01:~# du -sh /
du: cannot access '/proc/12244/task/12244/fd/3': No such file or directory
du: cannot access '/proc/12244/task/12244/fdinfo/3': No such file or directory
du: cannot access '/proc/12244/fd/4': No such file or directory
du: cannot access '/proc/12244/fdinfo/4': No such file or directory
7.5T    /
root@NAS-01:~# du -sh /data
7.4T    /data

root@NAS-01:~# du -hd1 /
6.4M    /bin
0       /boot
4.0K    /dev
11M     /etc
4.0K    /home
33M     /lib
4.0K    /lib64
0       /media
4.6M    /opt
du: cannot access '/proc/12337/task/12337/fd/3': No such file or directory
du: cannot access '/proc/12337/task/12337/fdinfo/3': No such file or directory
du: cannot access '/proc/12337/fd/4': No such file or directory
du: cannot access '/proc/12337/fdinfo/4': No such file or directory
0       /proc
20K     /root
91G     /run
11M     /sbin
0       /srv
0       /sys
0       /tmp
272M    /usr
316M    /var
0       /mnt
7.4T    /data
2.5M    /apps
31M     /frontview
7.5T    /

StephenB
Guru - Experienced User
Feb 23, 2021
pwptech wrote:

To delete all snapshots should I just delete all directories containing .snapshot as the name? When I show all snapshots under /data I only have 1 listed and it's less than 150MB.

root@NAS-01:~# btrfs subv list -s /data ID 40579 gen 49790139 cgen 49790139 top level 6346 otime 2021-02-17 00:00:16 path MSDS/.snapshots/980/snapshot
root@NAS-01:~# du -sh /data/MSDS/.snapshots
127M /data/MSDS/.snapshots

No, you won't be able to delete the snapshots with rm. They are btrfs subvolumes - so you can delete them with btrfs subv delete <path>

Try turning off volume quota (from the volume settings wheel), and then turn it back on.

I'd also try another balance.

rn_enthusiast might have some other suggestions.
- pwptech
  Tutor
  Feb 24, 2021
  Thanks for the suggestionsStephenB
  
  I have disabled then re-enabled quota. I also did Disk Balance and it completed successfully. The snapshots have been removed now but I'm still facing the same issue where about 2TB seems to be missing. I am showing 10.09TB for Data in the frontend.
  
  I will also perform a scrub and defrag. Short of that working I'm not sure what else could be done except rebuilding the array which I really don't want to do.
  - rn_enthusiast
    Virtuoso
    Feb 25, 2021
    Hi pwptech
    
    Would you mind grabbing the NAS log-set for me? Then I will have a look at it. On the web admin page, go to "System" > "Logs" > click "Download logs".
    
    This should download a zip file containing all the logs. You can then upload that zip file to Google Drive, Dropbox or similar and make a link which I can use to download it. PM me this link - don't post it publicly here.
    
    Thanks for the ping StephenB :)
    
    Cheers