Re: [RFC] New attempt to a better "btrfs fi df"

[Goffredo Baroncelli <kreijack@gmail.com>]

On 2012-10-25 22:11, cwillu wrote:
>>> 3. How does Data: total=72GB before rebalance, but is 5GB after
>>> rebalance? This was a brand new file system, file system
>>> installed, with maybe 2-3 updates, and a dozen or two reboots.
>>> That's it. No VM's created on that volume (it's a VDI itself),
>>> and the VDI file itself never grew beyond 9GB.
> Combine the previous two answers: You had 72GB allocated to block 
> groups which are mostly empty.  After the balance, the contents of 
> those groups have been shuffled around such that most of them could
> be freed.

Did btrfs rebalance when it needs spaces ? The example reported by Chris
suggested that due to the filesystem history, btrfs allocate some chunk
that became empty.
If the user/admin don't make a (re)balance, is btrfs capable to move
some chunk from the DATA pool to the METADATA pool when the space became
low autonomously ?
I don't think, but I want a confirmation.

BR
G.Baroncelli

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