“No volume ID returned by volume snapshotter for persistent volume” warning is shown for NFS volumes.

[reitermarkus]

What steps did you take and what happened:

Created a backup. It completed successfully, but shows the following warning for an NFS PV:

Warnings:
  Velero:     <none>
  Cluster:   resource: /persistentvolumes name: /my-volume message: /No volume ID returned by volume snapshotter for persistent volume
  Namespaces: <none>

All pods which are using this volume also have the corresponding backup.velero.io/backup-volumes-excludes annotation.

What did you expect to happen:

No warning, since there is no NFS snapshotter and the volume is excluded from backups.

Anything else you would like to add:

Related to #7672.

Volume definition:

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: myvolume
spec:
  capacity:
    storage: 100Ti
  volumeMode: Filesystem
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Retain
  storageClassName: nfs
  mountOptions:
    - hard
    - nfsvers=4.1
  nfs:
    path: /mypath
    server: myserver

Environment:

• Velero version (use velero version): v1.13.2
• Velero features (use velero client config get features):
• Kubernetes version (use kubectl version): v1.29.6
• Kubernetes installer & version: Talos 1.7.5
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):

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[ywk253100]

The annotationbackup.velero.io/backup-volumes-excludes is used for file system backup: https://velero.io/docs/v1.14/file-system-backup/#using-the-opt-out-approach

For native snapshot, please define a resource policy to skip the volume:
https://velero.io/docs/v1.14/resource-filtering/#resource-policies

[reitermarkus]

@ywk253100, thanks, resource policy was what I was missing.