Adding an OSD node to a Ceph cluster is an online process. To demonstrate this, we require a new virtual machine named ceph-node4 with three disks; we will add this node to our existing Ceph cluster.

Create a new node ceph-node4 with three disks (OSDs). You can follow the process of creating a new virtual machine with disks, OS configuration, and Ceph installation as mentioned in Chapter 2, Ceph Instant Deployment, and Chapter 5, Deploying Ceph – the Way You Should Know.

Once you have the new node ready for addition to a Ceph cluster, check the current Ceph OSD details:

# ceph osd tree

This is what you will get once this command is run:

Expanding a Ceph cluster is an online process, and to demonstrate this, we will perform some operations on our Ceph cluster; we will also expand the cluster in parallel. In Chapter 5, Deploying Ceph – the Way You Should Know, we deployed the Ceph RADOS block device on a ceph-client1 machine. We will use the same machine to...