Re: BTRFS over LVM remounts read-only

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On Sat, 11 Jan 2014 19:48:55 +0100
Szalma László <dblaci@xxxxxxxxx> wrote:

> 2014-01-11 18:10 keltezéssel, MegaBrutal írta:
> > How can I shrink the FS to the correct size right now, ensuring that I 
> > really shrink it to the exact LV size?
> 
> btrfs fi re 10G /dev/mapper/vg-lv
> lvresize -L 10G vg/lv

That's setting yourself up for a failure if these tools happen to disagree on
what "G" means (GB vs GiB). Maybe that's what happened here with the thread
starter's FS?

To be completely safe, I would recommend to resize the FS in two steps, leaving
some safety margin to the partition resize first:

  btrfs fi re 8G /dev/mapper/vg-lv
  lvresize -L 10G vg/lv
  btrfs fi re max /dev/mapper/vg-lv

-- 
With respect,
Roman

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