On Wed, Mar 30, 2016 at 3:03 AM, Jason Dillaman <dillaman@xxxxxxxxxx> wrote:
> Understood -- format 2 was promoted to the default image format starting with Infernalis (which not all users would have played with since it isn't LTS). The defaults can be overridden via the command-line when creating new images or via the Ceph configuration file.
>
> I'll let Ilya provide input on which kernels support image format 2, but from a quick peek on GitHub it looks like support was added around the v3.8 timeframe.
Layering (i.e. format 2 with default striping parameters) is supported
starting with 3.10. We don't really support older kernels - backports
are pretty much all 3.10+, etc.
Thanks,
Ilya
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