Before starting to cover some recovery techniques, it is important to cover some points discussed in Chapter 1, Planning for Ceph. Disaster recovery should be seen as a last resort; the recovery guides in this chapter should not be relied upon as a replacement for following best practices.
Firstly, make sure you have working and tested backups of your data; in the event of an outage you will feel a million times more relaxed if you know that in the worst cases, you can fall back to backups. While an outage may cause discomfort for your users or customers, informing them that their data, which they had entrusted you with, is now gone and is far worse. Also, just because you have a backup system in place, do not blindly put your trust in it. Regular test restores will mean that you will be able to rely on them when needed.
Make sure you follow some design principles also mentioned in Chapter 1,...