Rados Bench Scaling question from today's Ceph Perf Call

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Mark,
In today’s perf call you showed filestore and bluestore write cliffs. What, in your opinion, is the cause of the bluestore write cliff? Is that the size of the bluefs and/or rocksdb cache? You mentioned it could be solved by more HW which I took to mean bigger cache. Is that a correct assumption?
Thanks for the presentation.
Bruce



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