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

Configuring a cache tier


A cache tier has several configuration options that define the cache tier policy. This cache tier policy is required to flush data from the cache tier to the storage tier in case of a writeback. In the case of the read-only cache tier, it moves the data from the storage tier to the cache tier. In this recipe, I have tried to demonstrate the cache tier with the writeback mode. These are some settings that you should configure for your production environment, with different values based on your requirements:

How to do it…

  1. For production deployment, you should use the 'bloom filters' data structure:

    # ceph osd pool set cache-pool hit_set_type bloom
    
  2. hit_set_count defines how much time in seconds each hit set should cover, and hit_set_period defines how many such hit sets are to be persisted:

    # ceph osd pool set cache-pool hit_set_count 1
    # ceph osd pool set cache-pool hit_set_period 300
    
  3. target_max_bytes is the maximum number of bytes after the cache-tiering agent starts...