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    • https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/The_attention_LED_lit_on_when_the_DS212C_shelf_is_powered_on
      When the additional shelves are started, the attention LED on shelf 1 lights up before the nodes start. In the SAS-EXPANDER-MAP, only IOM B on shelf 1 is visible from 0a on the Controller-A side, and ...When the additional shelves are started, the attention LED on shelf 1 lights up before the nodes start. In the SAS-EXPANDER-MAP, only IOM B on shelf 1 is visible from 0a on the Controller-A side, and shelf 0, shelf 2, 0b, and 0c are not visible. Level 1: WWN 500a0980XXXXXXXX, ID 1, Serial Number ' SHJSG2411111111', Product 'DS21212IOM12 ', Rev '0141', Slot A In the shelf log on the Controller-A side, only shelf 0 is visible at the new timestamp.