Mounting an Additional Disk with data for Node Storage on OpenShift 4

Issue

Administrators may want to attach and mount an additional disk on OpenShift nodes without formatting it (i.e., preserving existing data). Common requirements include:

• Mounting an additional disk to the RHOCP worker nodes
• Avoiding reformatting if the disk already contains data
• Mounting an existing XFS-formatted disk at a specific path like /mnt/test
• Refer to this Red Hat Solution for mounting a separate disk for node container storage on OpenShift 4.
• Refer to this Red Hat Solution for mounting separate disk for OpenShift 4 etcd storage.