how to add single iscsi device to multiple hosts ?

  my setup have 3 esxi hosts and single ISCSI SAN. i already added SAN to one esxi host. after i try to add SAN to another host . first create ISCSI HBA on host . and added ISCSI target to it. after i try to create datastore no device show in create datastore wizard . how to add single ISCSI  to multiple hosts ?

thanks.