Book Image

Learning Ceph - Second Edition

By : Karan Singh, Vaibhav Bhembre, Anthony D'Atri
Book Image

Learning Ceph - Second Edition

By: Karan Singh, Vaibhav Bhembre, Anthony D'Atri

Overview of this book

Learning Ceph, Second Edition will give you all the skills you need to plan, deploy, and effectively manage your Ceph cluster. You will begin with the first module, where you will be introduced to Ceph use cases, its architecture, and core projects. In the next module, you will learn to set up a test cluster, using Ceph clusters and hardware selection. After you have learned to use Ceph clusters, the next module will teach you how to monitor cluster health, improve performance, and troubleshoot any issues that arise. In the last module, you will learn to integrate Ceph with other tools such as OpenStack, Glance, Manila, Swift, and Cinder. By the end of the book you will have learned to use Ceph effectively for your data storage requirements.
Table of Contents (18 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Ceph pools


The concept of pool is not novel in storage systems. Enterprise storage systems are often divided into several pools to facilitate management. A Ceph pool is a logical partition of PGs and by extension Objects. Each pool in Ceph holds a number of PGs, which in turn holds a number of Objects that are mapped to OSDs throughout the cluster. This distribution across cluster nodes helps ensure the required level of RAS. In versions prior to Luminous, the initial Ceph deployment creates by default a pool named rbd; with Luminous or later you will need to create this yourself if you plan on providing block service. This might not be sufficient for all use-cases and it is recommended to create your own when needed. Deploying RGW or CephFS for your cluster will create the required pools automatically.

A pool guarantees data availability by defining and maintaining a desired number of copies of every object. The type of pool (replicated or erasure coded) determines how many copies of objects...