Re: several GB freespace missing

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

在 2024/6/3 03:53, Bhasker C V 写道:
> Below is the status
>
>
> $ sudo btrfs fi df .
> Data, single: total=139.01GiB, used=136.63GiB
> System, DUP: total=32.00MiB, used=48.00KiB
> Metadata, DUP: total=1.00GiB, used=191.61MiB
> GlobalReserve, single: total=169.20MiB, used=0.00B
> $ sudo df -h .
> Filesystem                Size  Used Avail Use% Mounted on
> /dev/mapper/datafs        160G  138G   22G  87% /tmp/user/1000/data
> $ sudo du -hs .
> 90G     .
> $ sudo btrfs su li .

Please try "btrfs subvolume list -a" to list all subvolumes.

> $
>
> I have tried a btrfs balance with --dusage=90
> I have scrubbed the data
> I have done a full csum
>
> I am not sure how to recover from the 48GB discrepancy
>
> Please could someone tell me what is happening and how i can get back
> my disk space ?

Another possibility is related to the btrfs extent bookend behavior, can
waste a lot of space if the workload involves a lot of random small writes.

In that case you may want to defrag the fs.

Thanks,
Qu

>