On Sun, 2021-01-10 at 17:08 -0700, Chris Murphy wrote:
> On Sun, Jan 10, 2021 at 4:09 PM Patrick O'Callaghan
> <pocallag...@gmail.com> 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.

Several hours later, it's done. Thanks again.

poc
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