Cold-replace a shelf - DS212C, DS224C, and DS460C
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When replacing a drive shelf in a production system that has disks in use, you need to perform a cold shelf replacement. This is a disruptive procedure for shelves with IOM12 or IOM12B modules. It requires you to halt the controllers in your HA pair.
Use the NetApp Knowledge Base article How to replace a shelf chassis using a cold shelf removal procedure.