In this chapter, we will cover the following recipes:

• Ceph scalability and high availability
• Understanding the CRUSH mechanism
• CRUSH map internals
• CRUSH tunables
• Ceph cluster map
• High availability monitors
• Ceph authentication and authorization
• I/O path from a Ceph client to a Ceph cluster
• Ceph placement group
• Placement group states
• Creating Ceph pools on specific OSDs