Designing and Tuning for All-Flash Ceph RBD Storage | Ceph Days NYC 2024

Tyler Stachecki speaks at Ceph days NYC about openStack cloud providers and operators. Ceph RBD integrates well with Cinder services and provides very reliable, highly performant block storage. Unfortunately, while Ceph RBD clusters are easy to get up and going, extracting the maximum possible performance from all-flash Ceph RBD clusters is a bit of a black art.

A cursory online search might suggest that one use specific RocksDB settings, place multiple OSDs on each NVMe, or even set some unusual sysctls. However, when tested, we found that most of these suggestions found online are either ineffective, actually degrade performance, or are no longer applicable to recent versions of Ceph. On the other hand, much of the tuning we have found to be effective was only discovered by the community at large more recently, or has yet to be fully realized.

In this talk, we will go over some tips and tricks that have worked well for us in designing and configuring performant RBD clusters using modern versions of Ceph, as well as future possible code changes we believe will extract even more performance out of flash-backed OSDs.

Website: https://ceph.io/en/community/events/2...