On Sun, May 06, 2012 at 11:37:27AM +0100, Hugo Mills wrote:
> On Sun, May 06, 2012 at 01:26:45PM +0300, Ilya Dryomov wrote:
> > On Sun, May 06, 2012 at 01:07:06PM +1000, Mike Sampson wrote:
> > > There is now 8GB less in Metadata and I was able to delete some files
> > > as well to free up space. There is still a lot of wasted space in the
> > > metadata block groups. It seems that it allocates more metadata block
> > > groups than required for my filesystem. This will do until I am able
> > > to add a couple of devices to the system. Is there anyway to adjust
> > > the block group allocation strategy at filesystem creation?
> >
> > No. Chunk allocator currently allocates a lot more chunks than actually
> > needed, and it impacts both balancing and normal operation. Try this:
> >
> > # btrfs balance start -musage=10 /home
> >
> > This is suboptimal, but it should get rid of more chunks.
>
> While we're talking about it, what is the parameter to the "usage"
> option? I'm assuming it selects chunks which are less than some amount
> full -- but is the value a percentage, or a quantity in megabytes
> (power-of-10 or power-of-2), or something else?
It's a percentage, so the command above will balance out chunks that are
less than 10 percent full. I'll update btrfs man page and the wiki page
you started as soon as I can.
Thanks,
Ilya
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