I can not see the datastore on that host.
Under configuration - storage adapters i see vmhba0 with 3 devices and all 3 are marked active and mounted.
Under configuration - storage i only see the other 2 datastores.
After a rescan nothing happens.
We also moved the VM to one of the other hosts where we see the datastore. Even on this host we get the i/o error. But we can browse the datastore in the vSphere client on that host.