I'm not familiar with Dell storage systems. However, usually you need to configure the ESXi host on the storage system (either using the ESXi host's iSCSI IQN or IP address, depending on the storage system) and then present the LUN to this host object.
In case the hosts do not run in a cluster - i.e. managed by vCenter Server - it's your responsibility to ensure they don't access the same VMs simultaneously!
André