Btrfs devel - Feb 2014 - BUG: >16TB Btrfs volumes are mountable on 32 bit kernels

User reports successfully formatting and using an ~18TB Btrfs volume on hardware
raid5 using i686 kernel for over a year, and then suddenly the file system
starts behaving weirdly:

http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg31856.html


I think this is due to the kernel page cache address space being 16TB limited on
32-bit kernels, as mentioned by Dave Chinner in this thread:

http://oss.sgi.com/pipermail/xfs/2014-February/034588.html

So it sounds like it shouldn't be possible to mount a Btrfs volume larger
than 16TB on 32-bit kernels. This is consistent with ext4 and XFS which refuse
to mount large file systems.



Chris Murphy--
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