Re: Help! - "btrfs device delete missing" running out of space

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On Sun, 2014-01-05 at 19:00 +0000, Piotr Pawłow wrote:
> Hello,
> > distribution, used space on each device should be accordingly: 160, 
> > 216, and 405.
> 
> The last number should be 376, I copied the wrong one. Anyway, I deleted 
> as much data as possible, which probably won't help in the end, but at 
> the moment it's still going. Meanwhile, I made a script to replicate this 
> problem:
> 
> http://pastebin.com/W2c2pJYp

I'm not sure what the solution is, but the issue seems to be that btrfs
is laying out the RAID1 like this:

Mirror A   Mirror B
+------+   +------+
| 250g |   | 300g |
+------+   |      |
|      |   +------+
| 500g |   ////////
|      |   ////////
+------+   ////////

Rather than the hoped-for:

Mirror A   Mirror B
+------+   +------+
| 250g |   |      |
+------+   | 500g |
| 300g |   |      |
|      |   +------+
+------+   ////////

As far as I know, there's no way to tune this at the moment.

-- 
Calvin Walton <calvin.walton@xxxxxxxxxx>

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