On Sun, Nov 23, 2014 at 07:52:29AM +0000, Duncan wrote:
> > Right. So, why would you rebalance empty chunks or near empty chunks?
> > Don't you want to rebalance almost full chunks first, and work you way
> > to less and less full as needed?
> 
> No, the closer to empty a chunk is, the more effect you can get in 
> rebalancing it along with others of the same fullness.

On Sun, Nov 23, 2014 at 10:49:01PM +0000, Holger Hoffstätte wrote:
> Maybe also add that as of 3.18 empty block groups are automatically
> collected, so balancing to prevent ENOSPC-by-empty-chunks is no longer
> necessary. This works pretty well; I haven't run balance in weeks,
> and my total-vs.-used overhead has always been <10 GB.

Sorry for the delay in confirming this.
I've corrected both 
https://btrfs.wiki.kernel.org/index.php/Balance_Filters#Balancing_to_fix_filesystem_full_errors
and
http://marc.merlins.org/perso/btrfs/post_2014-05-04_Fixing-Btrfs-Filesystem-Full-Problems.html
with your input.

Thanks much for that.
Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/                         | PGP 1024R/763BE901
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