Statefulsets ordered resources PVC expectation

[gmilamitrs]

I have noticed that when setting pods in the ordered resources, their related PVCs are backed up in the same order. If setting the stateful sets as the ordered resources, PVCs do not follow the same ordering. Is this expected?

[blackpiglet]

This is expected.

When the pod is backed up in order, because each mounted PVC is returned with the pod, the mounted PVCs are backed up in the same order with the pod.

If the statefulset is ordered, then the pods of the statefulset's order are not generated. So the PVC cannot follow the previous order.

[gmilamitrs]

Just to confirm, ordering StatefulSets does not guarantee that all Pods (and PVCs) from the first StatefulSet in the ordered list are backed up before Pods from the next StatefulSet. I understand that ordering of Pods within a StatefulSet is not guaranteed; my question is specifically about ordering across StatefulSets. Thank you

[blackpiglet]

That's correct. The order of statefulsets doesn't guarantee the order of their created pods.
For Velero, it doesn't recognize the relation between the statefulesets and the pods.

[gmilamitrs]

Thanks!