Re: Compression on Btrfs

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On Sun, Jan 10, 2021 at 4:09 PM Patrick O'Callaghan
<pocallaghan@xxxxxxxxx> wrote:
>
> > If you're using libvirt, creating a new pool on Btrfs will automatically
> > set +C attribute.
>
> It wasn't Btrfs at the time the image was created.

Ahh gotcha. A proper conversion guide should point out this gotcha.
The work around might be chattr +C before the conversion, but I
haven't tested it.

>
> > It's not possible to set this attribute once a file has data in it, it's
> > not retroactive. You'll need to duplicate the file, in that same directory.
> > Because the directory has the attribute now, the duplicate will inherit the
> > attribute.
>
> That's somewhat painful as the file is over 900GB and will need to be
> copied to another drive and then back again, but thanks anyway.

As long as the cache mode is writeback or none, it'll be OK.


-- 
Chris Murphy
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