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SinglePathToDiskShelf_Alert from degraded connectivity due to loose cable

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fas-systems
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hw
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Applies to

  • ONTAP 9 
  • AFF systems
  • ASA systems
  • FAS systems

Issue

  • Alert received:
[Node-01: mgwd: callhome.hm.alert.major:alert]: Call home for Health Monitor process nchm: SinglePathToDiskShelf_Alert
  • The expander map does not show all shelves on both paths:
::> system node run -node <node_name> sasadmin expander_map

Expanders on channel 0b: 
Level    1: WWN <World_Wide_Name_id>,  ID  5, Product 'DS424IOM3', Rev '0212', Slot B
Level    2: WWN <World_Wide_Name_id>,  ID  4, Product 'DS424IOM3', Rev '0212', Slot B
Level    3: WWN <World_Wide_Name_id>,  ID  3, Product 'DS424IOM3', Rev '0212', Slot B

Expanders on channel 0c: 
Level    1: WWN <World_Wide_Name_id>,  ID  0, Product 'DS424IOM3', Rev '0212', Slot A
Level    2: WWN <World_Wide_Name_id>,  ID  1, Product 'DS424IOM3', Rev '0212', Slot A
Level    3: WWN <World_Wide_Name_id>,  ID  2, Product 'DS424IOM3', Rev '0212', Slot A
Level    4: WWN <World_Wide_Name_id>,  ID  3, Product 'DS424IOM3', Rev '0212', Slot A
Level    5: WWN <World_Wide_Name_id>,  ID  4, Product 'DS424IOM3', Rev '0212', Slot A
Level    6: WWN <World_Wide_Name_id>,  ID  5, Product 'DS424IOM3', Rev '0212', Slot A

  • Shelf 0,1 and 2 are seen as missing from path 0b.
  • ENVIRONMENT log may report SAS cable information missing:

Shelf: 6
 SAS cable information by element:
  [1] Vendor: <N/A> (disconnected)
   Type: <N/A> <N/A> <N/A>  ID: <N/A>  Swaps: 0
   Serial number: <N/A>  Part number: <N/A>  


 

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