Ok, you could just run a command to do it to all your luns but that is OK. Next thing I would do is to install the netapp plugin in vcenter and apply all recommended settings. If I remember, MPIO, NFS and another one I don't remember but it is important. Just go apply ALL recomended settings. It will change queu deth and some more. Thats is for sure the NepApp recommended settings so start there. I had a similar issue with a FAS 2240 with iscsi and vmknic binding for multipathing. When I changed to RR.... huge latencies, a lot of problems. Apply the settings reboot.
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