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[[File:Ceph-funnel-en.svg|500px|right]][[ru:Производительность Ceph]]Ceph is a Software-Defined Storage system. It's very feature-rich: it provides object storage, VM disk storage, shared cluster filesystem and a lot of additional features. In some ways, it's even unique. It could be an excellent solution which you could take for free, immediately solve all your problems, become a cloud provider and earn piles of money. However there is a subtle problem: PERFORMANCE. Rational people rarely want to lower the performance down by 95 % in production. It seems cloud providers like AWS, GCP, Yandex don't care - all of them run their clouds on top of their own crafted SDS-es (not even Ceph) and all these SDS-es are just as slow. :-) we don't judge them of course, that's their own business. This article describe which performance indicators you can achieve with Ceph and how. But I warn you: you won't catch up with local SSDs. Local SSDs (especially NVMe) are REALLY fast right now, their latency is around 0.05ms. It's very hard for an SDS to achieve the same result, and beating it is almost impossible. It's just the network that will eat those 0.05ms.
== General benchmarking principles ==
