The Netapp doc mentioned is pretty good.
I also use the Netapp Config Advisor tool
http://support.netapp.com/NOW/download/tools/config_advisor/
you can run it before against the Filers to confirm you have multipath and after to confirm the cabling is correct.
It's picked up a few issues in the past e.g. SAS cables connected on same ASIC.
Probably obvious but the shelves also need to be power cycle after the ID has been changed.
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