Book Image

Mastering Ceph, - Second Edition

By : Nick Fisk
Book Image

Mastering Ceph, - Second Edition

By: Nick Fisk

Overview of this book

Ceph is an open source distributed storage system that is scalable to Exabyte deployments. This second edition of Mastering Ceph takes you a step closer to becoming an expert on Ceph. You’ll get started by understanding the design goals and planning steps that should be undertaken to ensure successful deployments. In the next sections, you’ll be guided through setting up and deploying the Ceph cluster with the help of orchestration tools. This will allow you to witness Ceph’s scalability, erasure coding (data protective) mechanism, and automated data backup features on multiple servers. You’ll then discover more about the key areas of Ceph including BlueStore, erasure coding and cache tiering with the help of examples. Next, you’ll also learn some of the ways to export Ceph into non-native environments and understand some of the pitfalls that you may encounter. The book features a section on tuning that will take you through the process of optimizing both Ceph and its supporting infrastructure. You’ll also learn to develop applications, which use Librados and distributed computations with shared object classes. Toward the concluding chapters, you’ll learn to troubleshoot issues and handle various scenarios where Ceph is not likely to recover on its own. By the end of this book, you’ll be able to master storage management with Ceph and generate solutions for managing your infrastructure.
Table of Contents (18 chapters)
Free Chapter
Section 1: Planning And Deployment
Section 2: Operating and Tuning
Section 3: Troubleshooting and Recovery


RADOS pools are the core part of a Ceph cluster. Creating a RADOS pool is what drives the creation and distribution of the placement groups, which themselves are the autonomous part of Ceph. Two types of pools can be created, replicated, and erasure-coded, offering different usable capacities, durability, and performance. RADOS pools can then be used to provide different storage solutions to clients via RBS, CephFS, and RGW, or they can be used to enable tiered performance overlaying other RADOS pools.

Replicated pools

Replicated RADOS pools are the default pool type in Ceph; data is received by the primary OSD from the client and then replicated to the remaining OSDs. The logic behind the replication is fairly simple...