Cephalocon 2022

Modern flash storage devices have evolved in many ways in the past few years. Z-SSD provides higher IOPS and throughput than existing NVMe SSD. ZNS SSD significantly reduces write amplification and expands SSD life span at a low cost. In addition, NVMeOF technology is about to replace existing storage network with the protocol that exploits NVMe command over RDMA. In this talk, I will introduce four topics with regard to changes on modern SSDs I currently working on: 1) Seastore development for fast NVMe device including design proposal for ZNS SSD’s append command, 2) Tiering/Dedup status, 3) NVMeOF on Ceph. Firstly, I will explain a write strategy based on circular bounded journal and random block manager on Seastore and propose how the append command, which has been newly added in ZNS spec.,can be used in Seastore. Next, tiering/dedup feature development status will be introduced. Finally, I will give some thoughts on NVMeOF and Ceph.