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Mastering Ceph

By : Nick Fisk

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Buy this Book

Mastering Ceph

5 (4)

By: Nick Fisk

Buy this Book

Overview of this book

Mastering Ceph covers all that you need to know to use Ceph effectively. Starting with design goals and planning steps that should be undertaken to ensure successful deployments, you will be guided through to setting up and deploying the Ceph cluster, with the help of orchestration tools. Key areas of Ceph including Bluestore, Erasure coding and cache tiering will be covered with help of examples. Development of applications which use Librados and Distributed computations with shared object classes are also covered. A section on tuning will take you through the process of optimisizing both Ceph and its supporting infrastructure. Finally, you will learn to troubleshoot issues and handle various scenarios where Ceph is likely not to recover on its own. By the end of the book, you will be able to successfully deploy and operate a resilient high performance Ceph cluster.

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

Planning for Ceph

What is Ceph?

How Ceph works?

Ceph use cases

Specific use cases

Infrastructure design

Network design

How to plan a successful Ceph implementation

Summary

Deploying Ceph

Preparing your environment with Vagrant and VirtualBox

Orchestration

Ansible

A very simple playbook

Adding the Ceph Ansible modules

Change and configuration management

Summary

BlueStore

What is BlueStore?

Why was it needed?

How BlueStore works

How to use BlueStore

Summary

Erasure Coding for Better Storage Efficiency

What is erasurecoding?

How does erasure coding work in Ceph?

Algorithms and profiles

Where can I use erasure coding?

Creating an erasure-coded pool

Summary

Developing with Librados

What is librados?

How to use librados?

Example librados application

Summary

Distributed Computation with Ceph RADOS Classes

Example applications and the benefits of using RADOS classes

Writing a simple RADOS class in Lua

Writing a RADOS class that simulates distributed computing

RADOS class caveats

Summary

Monitoring Ceph

Why it is important to monitor Ceph

What should be monitored

PG states -the good, the bad, and the ugly

Monitoring Ceph with collectd

Summary

Tiering with Ceph

Tiering versus caching

What is a bloom filter

Tiering modes

Uses cases

Creating tiers in Ceph

Tuning tiering

Promotion throttling

Summary

Tuning Ceph

Latency

Benchmarking

Recommended tunings

Summary

Troubleshooting

Repairing inconsistent objects

Full OSDs

Ceph logging

Slow performance

Extremely slow performance or no IO

Investigating PGs in a down state

Large monitor databases

Summary

Disaster Recovery

What is a disaster?

Avoiding data loss

What can cause an outage or data loss?

RBD mirroring

RBD recovery

Lost objects and inactive PGs

Recovering from a complete monitor failure

Using the Cephs object store tool

Investigating asserts

Summary

Customer Reviews

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Algorithms and profiles

There are a number of different erasure plugins you can use to create your erasure-coded pool.

Jerasure

The default erasure plugin in Ceph is the Jerasure plugin, which is a highly optimized open source erasure coding library. The library has a number of different techniques that can be used to calculate the erasure codes. The default is Reed-Solomon and provides good performance on modern processors which can accelerate the instructions that the technique uses. Cauchy is another technique in the library; it is a good alternative to Reed- Solomon and tends to perform slightly better. As always, benchmarks should be conducted before storing any production data on an erasure-coded pool to identify which technique best suits your workload.

There...