Book Image

Ceph Cookbook

Book Image

Ceph Cookbook

Overview of this book

Ceph is a unified, distributed storage system designed for excellent performance, reliability, and scalability. This cutting-edge technology has been transforming the storage industry, and is evolving rapidly as a leader in software-defined storage space, extending full support to cloud platforms such as Openstack and Cloudstack, including virtualization platforms. It is the most popular storage backend for Openstack, public, and private clouds, so is the first choice for a storage solution. Ceph is backed by RedHat and is developed by a thriving open source community of individual developers as well as several companies across the globe. This book takes you from a basic knowledge of Ceph to an expert understanding of the most advanced features, walking you through building up a production-grade Ceph storage cluster and helping you develop all the skills you need to plan, deploy, and effectively manage your Ceph cluster. Beginning with the basics, you’ll create a Ceph cluster, followed by block, object, and file storage provisioning. Next, you’ll get a step-by-step tutorial on integrating it with OpenStack and building a Dropbox-like object storage solution. We’ll also take a look at federated architecture and CephFS, and you’ll dive into Calamari and VSM for monitoring the Ceph environment. You’ll develop expert knowledge on troubleshooting and benchmarking your Ceph storage cluster. Finally, you’ll get to grips with the best practices to operate Ceph in a production environment.
Table of Contents (18 chapters)
Ceph Cookbook
Credits
Foreword
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Creating an erasure coded pool


Erasure code is implemented by creating a Ceph pool of the type erasure. This pool is based on an erasure code profile that defines erasure-coding characteristics. We will first create an erasure code profile, and then we will create an erasure-coded pool based on this profile.

How to do it…

  1. The command mentioned in this recipe will create an erasure code profile with the name EC-profile, which will have characteristics of k=3 and m=2, which are the numbers of data and coding chunks respectively. So, every object that is stored in the erasure-coded pool will be divided into 3 (k) data chunks, and 2 (m) additional coding chunks are added to them, making a total of 5 (k + m) chunks. Finally, these 5 (k + m) chunks are spread across different OSD failure zones.

    • Create the erasure code profile:

      # ceph osd erasure-code-profile set EC-profile rulesetfailure-domain=osd k=3 m=2
      
    • List the profile:

      # ceph osd erasure-code-profile ls
      
    • Get the contents of your erasure code...