On Tue, 18 Oct 2016 00:19:53 +0200 Lars Marowsky-Bree wrote:

> On 2016-10-17T15:31:31, Maged Mokhtar <mmokh...@petasan.org> wrote:
> > This is our first beta version, we do not support cache tiering. We
> > definitely intend to support it.
> Cache tiering in Ceph works for this use case. I assume you mean in
> your UI?
May well be, but Oliver suggested that cache-tiering is not supported with
Hammer (0.94.x), which it most certainly is.
Unless you use 0.94.6, which will eat your babies and data.

> Though we all are waiting for Luminous to do away with the need for
> cache tiering to do rbd to ec pools ...
Well, there's the EC band-aid use case for cache-tiers, but they can be
very helpful otherwise, depending on the size of working set/cache-pool,
configuration of the cache-pool (write-back vs. read-forward) and
specific use case.

Christian Balzer        Network/Systems Engineer                
ch...@gol.com           Global OnLine Japan/Rakuten Communications
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