Detaching a Volume

When an instance no longer needs access to a volume, you can detach the volume from the instance without affecting the volume's data.

Required IAM Policy

To use Oracle Cloud Infrastructure, you must be granted security access in a policy  by an administrator. This access is required whether you're using the Console or the REST API with an SDK, CLI, or other tool. If you get a message that you don’t have permission or are unauthorized, verify with your administrator what type of access you have and which compartment  to work in.

For administrators: The policy in Let users launch compute instances includes the ability to attach/detach existing block volumes. The policy in Let volume admins manage block volumes, backups, and volume groups lets the specified group do everything with block volumes and backups, but not launch instances.

If you're new to policies, see Getting Started with Policies and Common Policies. For reference material about writing policies for instances, cloud networks, or other Core Services API resources, see Details for the Core Services.

Using the Console


For volumes attached using iSCSI, we recommend that you unmount and disconnect the volume from the instance using iscsiadm before you detach the volume. Failure to do so may lead to loss of data. See Disconnecting From a Volume for more information.
  1. Open the navigation menu and click Compute. Under Compute, click Instances.
  2. In the Instance list locate the instance. Click its name to display the instance details.
  3. In the Resources section on the Instance Details page, click Attached Block Volumes
  4. Click the Actions menu next to the volume you want to detach, and then click Detach. Confirm when prompted.