When a Compute instance is terminated in OCI, the associated boot volume is not deleted by default. If the termination settings don’t explicitly delete the boot volume, it persists and continues to generate storage charges. Because boot volumes are managed under the Block Volumes service, not within the Compute UI, they’re easy to overlook—especially in environments with frequent provisioning and teardown. Over time, these orphaned boot volumes can accumulate and contribute to unnecessary costs.
OCI charges for provisioned block volume storage per GB per month, regardless of whether the volume is actively attached to a compute instance. This applies equally to boot volumes and data volumes. Detached boot volumes incur charges unless explicitly deleted.
