I have a 5.1 vCenter with 3 clusters in it. One is 4.1 U1 cluster, and the other two are 5.1 U2 clusters.
We have a number of NetApp VMFS3 datastores that are zoned to be seen by the 4.1 cluster and one of the 5.1 clusters. The goal was to migrate the VMs from the old to the new cluster which worked.
After migrating the VMs are still on the datastores but now I don't want the 4.1 cluster to see it anymore. In the 5.1 hosts I can go to the configuration tab, click Storage, and then I can right click the datastore and choose Unmount. It would show a checklist of things.
But in the 4.1 cluster's storage page I don't see the Unmount option when right clicking the datastore.
Likewise if I go to the Datastores screen in vcenter instead the hosts and see all the datastores. If I right click the datastore I can choose Unmount but in the list of hosts that are connected to it the 4.1 hosts are missing.
Any ideas why the unmount option is missing from the host > configuration > Storage view as well as the hosts not showing being connected in the Datastores screen?