As I know，openstack Queens has the multiattach feature released which allows multiple hosts to attach to a volume.
So can you tell me how to set a FAS storage to support this feature.
Thank you very much!
Here is the documentation for NetApp's Trident for Kubernetes detailing multi-attach support, which I also see the first integration with the ONTAP driver is in ONTAP 9.9.1:
Trident for Kubernetes - Multi-Attach
There are no details to enable "multi-attach".