This is a rough guide, consult your storage device manufacturer documentation. ALUA is supported in some devices, but usually it's disabled by default. To enable ALUA, the following options should be changed: - EMC CLARiiON/VNX: "Failover Mode" should be changed to "4". - HPE 3PAR: "Host:" should be changed to "Generic-ALUA Persona 2 (UARepLun, SESLun, ALUA)". - Promise VTrak/Vess: "LUN Affinity" and "ALUA" should be changed to "Enable", "Redundancy Type" must be "Active-Active". - LSI/Engenio/NetApp RDAC class, as NetApp SANtricity E/EF Series and OEM arrays: "Select operating system:" should be changed to "Linux DM-MP (Kernel 3.10 or later)". - NetApp ONTAP: To check ALUA state: "igroup show -v <igroup_name>", and to enable ALUA: "igroup set <igroup_name> alua yes".