Lenovo ThinkAgile HX1321 Series User Manual page 89

http://sysmgt.lenovofiles.com/help/topic/LXPM/RAID_setup.html
7. Verify that the M.2 module is replaced successfully:
• The amber warning light on the node front panel is off.
• The system boots successfully with no POST errors or other errors.
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Chapter 8 Hardware replacement procedures