Supported direct-attached configurations with E-Series storage arrays
You can connect ONTAP systems in direct-attached configurations with E-Series storage arrays. You must verify redundancy in connections between the ONTAP systems and the storage arrays to avoid the possibility of a single point of failure. FlexArray Stretch MetroCluster supports direct-attached configurations with E-Series storage arrays. For more information see, the NetApp Interoperability Matrix Tool and Stretch MetroCluster installation and configuration.
The Interoperability Matrix contains information about the specific E-Series array models that are supported in direct-attached configurations with ONTAP system.
ONTAP supports the following direct-attached configurations with E-Series storage arrays:
Stand-alone basic configuration
In a stand-alone basic configuration, two FC initiator ports from the ONTAP system access the ports of a two-port array LUN group.
The following illustration shows a direct-attached configuration where the ONTAP FC initiator ports 0a and 0h access the target ports of a two-port array LUN group:
![da 2port standalone](../media/da_2port_standalone.gif)
Four-port array LUN group
Two FC initiator ports from each ONTAP system in an HA pair access different storage array ports in a four-port array LUN group for redundancy in connections.
The following illustration shows a direct-attached configuration where the ONTAP FC initiator ports access the target ports of a four-port array LUN group.
![da 4port hapair](../media/da_4port_hapair.gif)
You can also connect four FC initiator ports from each ONTAP system in the HA pair to two different four-port array LUN groups such that each FC initiator port in a port pair accesses the alternate LUN group.
The following illustration shows a direct-attached configuration where the ONTAP FC initiator ports access the target ports of two four-port array LUN groups:
![direct attached configuration with two four port array lun groups](../media/direct_attached_configuration_with_two_four_port_array_lun_groups.gif)
Eight-port array LUN group
Four FC initiator ports from each ONTAP system in an HA pair access different storage array ports in an eight-port array LUN group for redundancy in connections.
The following illustration shows a direct-attached configuration where the ONTAP FC initiator ports access the target ports of an eight-port array LUN group:
![eight port direct attached ha pair configuration](../media/eight_port_direct_attached_ha_pair_configuration.gif)