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

Chapter 18. Disaster Recovery

In the previous chapter, you learned how to troubleshoot common Ceph problems, which, although may be affecting the operation of the cluster, weren't likely to cause a total outage or data loss. This chapter will cover more serious scenarios where the Ceph cluster is down or unresponsive. It will also cover various techniques to recover from data loss. It is to be understood that these techniques are more than capable of causing severe data loss themselves and should only be attempted as a last resort. If you have a support contract with your Ceph vendor or have a relationship with Red Hat, it is highly advisable to consult them first before carrying out any of the recovery techniques listed in this chapter.

In this chapter, you will learn the following:

  • How to avoid data loss
  • How to use RBD mirroring to provide highly available block storage
  • How to investigate asserts
  • How to rebuild monitor dbs from OSDs
  • How to extract PGs from a dead OSD
  • How to recover from lost...