Re: efficiency of btrfs cow

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> So it's clear that total usage (as reported by df) was 121,402,328KB but
> Metadata has two values:
>
> Metadata: total=5.01GB, used=3.26GB
>
> What's the difference between total and used? ÂAnd for that matter,
> what's the difference between the total and used for Data
> (total=110.01GB, used=109.26GB)?
>

total is the space allocated (reserved) for a kind usage (metadata or
data) the space allocated for a kind of usage can't be used for
something else. The used value is the space that is used from the
space that has been allocated for a kind of usage.

The wiki gives you a overview how to interpret the values:

https://btrfs.wiki.kernel.org/index.php/FAQ#btrfs_filesystem_df_.2Fmountpoint

cheers Kolja.
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