On Mon, Feb 2, 2015 at 1:03 PM, Borzenkov, Andrei andrei.borzenkov@ts.fujitsu.com wrote:
My best guess is that filer ports were configured as initiator by default and somehow conflicted with host HBAs (filer will try to use LUNs is found as disks). Do you use two port zones on fan-out (single initiator - multiple targets)? Note that motherboard replacement procedure recommends unconnecting ports until they are properly configured.
Due to "historical reasons" our zones are "two initiators, multiple targets", i know it's sub-optimal, but that's the way it is. Such zones always worked with controlled failovers, OnTAP upgrades etc.
When the NetApp technician arrived, I specifically asked him if it would be the best to disable respective ports on the fabrics for the filer in question (as I bet I saw this behaviour already once), but the answer was "no, it sould not affect anything".