Re: New file system with same issue

["Holger Hoffstätte" <holger.hoffstaette@googlemail.com>]

On 03/14/16 21:13, Marc Haber wrote:
> On Mon, Mar 14, 2016 at 01:48:18PM +0100, Holger Hoffstätte wrote:
>> did you ever try to clear the free-space cache via -o clear_cache
>> on mount?
> 
> This was not asked, and I didn't try. Since this is an encrypted root
> filesystem, is it a workable way to add clear_cache to /etc/fstab,
> rebuild initramfs and reboot? Or do you recommend using a rescue system?

If you can do it via a rescue system that might be easiest, but adding
it to fstab and rebooting once has the same effect. Whatever you know
how to do safely.

>> Give it a try, let it run for a while and then try balancing
>> again.
> 
> Do I need to wait for clear_cache to finish, like until I see disk
> usage dropping?

The cache isn't that big, so you won't see a huge drop. Just use the
disk normally for a few minutes, after some time the cache will be
written out again.

>> _Someone_ is lying to btrfs in terms of device size and/or allocated
>> chunks, otherwise you wouldn't get the ENOSPC.
> 
> Which properties does a block device report other than size?

Well..at least all you can find in /sys/block/sdX/*. However, reading
the other subthread about the mismatching image size I'm now none the
wiser what else to suggest. :/

-h