Oracle Cloud Infrastructure’s (OCI) Block Volume feature allows users to attach a block volume to multiple compute instances. This is a great improvement from the previous limitation of being able to attach block volumes to only one compute at a time. This makes it easy to design Cloud solutions and lowers storage costs.
The diagrams here show how Block Storage can be shared in the read-write mode (shown on the Right) and in the read-only mode shown on the left side.
Sharing block volumes with multiple instances can be useful in various deployments and system designs, as shown below: