If you use Vitess with Kubernetes and need to grow your disk space, Kubernetes has certain capabilities to resize persistent storage.
However most techniques involve deleting and/or restarting the associated pods. This would mean stopping vttablets, which we recommend avoiding if possible.
As an alternative, you can migrate to new storage by performing a series of planned vertical shard migrations and shard reparents to new pods.
In future the PlanetScale Kubernetes operator may enable more dynamic persistent volume resizing, taking advantage of emerging Kubernetes flexibility in this area.