Book Image

Ceph: Designing and Implementing Scalable Storage Systems

By : Michael Hackett, Vikhyat Umrao, Karan Singh, Nick Fisk, Anthony D'Atri, Vaibhav Bhembre
Book Image

Ceph: Designing and Implementing Scalable Storage Systems

By: Michael Hackett, Vikhyat Umrao, Karan Singh, Nick Fisk, Anthony D'Atri, Vaibhav Bhembre

Overview of this book

This Learning Path takes you through the basics of Ceph all the way to gaining in-depth understanding of its advanced features. You’ll gather skills to plan, deploy, and manage your Ceph cluster. After an introduction to the Ceph architecture and its core projects, you’ll be able to set up a Ceph cluster and learn how to monitor its health, improve its performance, and troubleshoot any issues. By following the step-by-step approach of this Learning Path, you’ll learn how Ceph integrates with OpenStack, Glance, Manila, Swift, and Cinder. With knowledge of federated architecture and CephFS, you’ll use Calamari and VSM to monitor the Ceph environment. In the upcoming chapters, you’ll study the key areas of Ceph, including BlueStore, erasure coding, and cache tiering. More specifically, you’ll discover what they can do for your storage system. In the concluding chapters, you will develop applications that use Librados and distributed computations with shared object classes, and see how Ceph and its supporting infrastructure can be optimized. By the end of this Learning Path, you'll have the practical knowledge of operating Ceph in a production environment. This Learning Path includes content from the following Packt products: • Ceph Cookbook by Michael Hackett, Vikhyat Umrao and Karan Singh • Mastering Ceph by Nick Fisk • Learning Ceph, Second Edition by Anthony D'Atri, Vaibhav Bhembre and Karan Singh
Table of Contents (27 chapters)
Title Page
About Packt
Contributors
Preface
Index

Disaster recovery replication using RBD mirroring


RBD mirroring is an asynchronous replication of RBD images between multiple Ceph clusters. RBD mirroring validates a point-in-time consistent replica of any change to an RBD image, including snapshots, clones, read and write IOPS and block device resizing. RBD mirroring can run in an active+active setup or an active+passive setup. RBD mirroring utilizes the RBD journaling and exclusive lock features which enables the RBD image to record all changes to the image in order of which they occur. These features validate that a crash-consistent copy of the remote image is available locally. Before mirroring can be enabled on a Ceph cluster the journaling feature must be enabled on the RBD image.

The daemon responsible for ensuring point-in-time consistency from one Ceph cluster to the other is the rbd-mirror daemon. Depending on your chosen type of replication the rbd-mirror daemon runs on either a single cluster or an each participating in the mirroring...