The cause of this error is a mismatch between the Cluster/Host arrangement on vCenter vs. the hostgroup/host arrangement on the FlashArray. Ideally, a one-to-one relationship will exist between the Cluster on vSphere to a hostgroup on the FlashArray. All hosts within the Cluster will be represented on the FlashArray with a host entry, with each FlashArray host entry containing the IQN or WWN of the ESX host. If there are ESX hosts within the Cluster on vSphere which do not have a host entry within the corresponding hostgroup, you will receive the error mentioned above. Example: In the vCenter server, if you have a cluster with:ClusterA with: HostA (iqn-1) HostB (iqn-2) On the FlashArray, you need to make sure there is a hostgroup that has a host entry corresponding to each ESX host in vSphere:HostGroupA with: Host1 (iqn-1) Host2 (iqn-2)
The name of the hosts and cluster do not matter -- Only IQNs and WWNs are referenced.