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On 02/08/2012 06:20 PM, Jan Kara wrote:

  Thanks for your reply. I admit I was not sure what exactly size argument
should be. So after looking into the code for a while I figured it should
be a total size of the filesystem - or differently it should be size of
virtual block address space in the filesystem. Thus when filesystem has
more devices (or admin wants to add more devices later), it can be larger
than the first device. But I'm not really a btrfs developper so I might be
wrong and of course feel free to fix the issue as you deem fit.

The size of the fs is the total size of the individual disks.  When you limit the size, you limit the size of a disk, not the whole fs.  IIRC, mkfs initializes the fs on the first disk, which is why it was using that size as the size of the whole fs, and then adds the other disks after ( which then add their size to the total fs size ).  It might be nice if mkfs could take sizes for each disk, but it only seems to take one size for the initial disk.


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