On 08/26/2018 01:39 PM, Vasiliy Tolstov wrote:
Why avoid cache tier? Does this only for erasure or for replicated too?
Because cache tier is very uncommon feature. Cepher's was used it to
will have rbd writes to EC pools mostly, before Luminous [1]
Why this need for replicated? With cache tier you kill your performance.
If u need something like flash cache - direct your ssd/nvme's to solid
only pool and put it ahead hdd-rbd (osd still need nvme/ssd for rockdb
if u need performance) via bchace/dm-cache inside your vm's.
[1] https://ceph.com/community/new-luminous-erasure-coding-rbd-cephfs/
k
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