On Wed, Aug 24, 2016 at 04:12:22PM -0700, Eric Wheeler wrote:

On Wed, 24 Aug 2016, marcin@mejor.pl wrote:

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W dniu 24.08.2016 o 08:52, Kent Overstreet pisze:
[...]

Hi!

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Hey, sorry for the long delay, been sick past several days.

I was afraid that I'm asking to easy question:) And I hope everything is
fine with you now!

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The way arguments
were passed to bcache format was a holdover from old style make-bcache, and
didn't make much sense for bcachefs - -C was used for all devices, and
--tier
specifies fast devices and slow devices.

I finally got around to redoing the option parsing so we don't need the -C
argument today - update your bcache tools, and the command you want is now:

bcache format --tier 0 /dev/sde1 --tier 1 /dev/sdd1

Neat!  How many performance tiers are (will be) supported?  Arbitrary?

Currently the code just handles two, but the on disk format allows for up to 16.