Comment 5 for bug 1809249

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Walt Boring (walter-boring) wrote : Re: OS-brick FC scan fails when 3Par is not exported to controllers/computes through all FC targets

If multipath is enabled in the 3PAR driver section and multipathd is running, then a different codepath is taken in the 3PAR driver that will map all visible ports on the c-vol host and the 3PAR, and the volume attach should work. It's clear from the output listed in the bug that multipath isn't enabled as there is only a single initiator_target_port mapping.

Make sure you follow what I mentioned in comment #2. The 3par driver stanza in cinder.conf needs those 2 options specified.