If ReadWriteMany volume not supported, helm upgrade will hang with ReadWriteOnce volumn can't be attached to new pod.
Default helm update strategy with spec:
type: RollingUpdate
Recommend use ReadWriteMany volume if available, else user might need manually delete old replicaset to delete old pods and preserve existing templates data saved in the volume.
If ReadWriteMany volume not supported, helm upgrade will hang with ReadWriteOnce volumn can't be attached to new pod.
Default helm update strategy with spec:
type: RollingUpdateRecommend use ReadWriteMany volume if available, else user might need manually delete old replicaset to delete old pods and preserve existing templates data saved in the volume.