When an OpenStack Instance on the AMS2 platform is configured with Boot from volume, you cannot enlarge the boot volume as long as it is attached. If additional space is needed, there are two common solutions:
On the AMS2 platform, you can extend the volume regardless of its state, whether attached or detached.
It is not possible to detach it (this can only be done by deleting the instance).
Create a snapshot of the current boot volume
Step 1
Log in to the OpenStack Dashboard ‘Horizon’.
Step 2
In the OpenStack Dashboard, navigate to ‘Volumes’ in the left menu. Click ‘Volumes’ again.
In the next window, enter a name for your Volume Snapshot and click on ‘Create Volume Snapshot' to create the snapshot.
Step 3
Under “Volume Snapshots”, you will see the created snapshot.
In this overview you also see the original volume from which the snapshot was created.
We now continue with enlarging the volume.
Create a new larger volume from snapshot
Step 1
In the OpenStack Dashboard, navigate back to ‘Volumes’ in the left menu. Then click ‘Snapshots’. Now click ‘Create Volume’.
Step 2
In the new window that opens, specify the name and size of the new volume and click ‘Create Volume’.
If no name is given, it will keep the name of the snapshot.
Step 3
After you have created a new volume with the desired size from the snapshot, you return to the volumes page.
We have now reached the end of how to create a snapshot of a volume that you can then use to create a new instance.