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multipathd: sddw: alua not supported

Set prio to const in /etc/multipath.conf using device entry.

devices {
                device {
                                vendor                  "XtremIO"
                                product                 "XtremApp"
                                path_grouping_policy    multibus
                                path_selector           "queue-length 0" 
                                rr_min_io_rq            1 
                                prio                    const
                }
}