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FAS2820 (DISK REDUNDANCY FAILED) ERROR occurs

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Applies to

  • FAS2820
  • ONTAP 9

Issue

  • Autosupport  (DISK REDUNDANCY FAILED) ERROR is triggered from the node, resulting in degraded HA status on both nodes.

node-1: 

NetApp Release 9.14.1P6: Tue Jun 18 12:11:44 EDT 2024
    System ID: 0987654321 (node-1); partner ID: 0123456789 (node-2)
    System Serial Number: 95XXXXXXXXXX (node-1)
    System Rev: A6
    System Storage Configuration: Multi-Path HA <<< Before the issue, there is Tri-Path HA
    System ACP Connectivity: Inband Active
    SAS2/SAS3 Mixed Stack Support: all
    All-Flash Optimized: false
    Capacity Optimized: false
 All SAN Array: false
    Backplane Part Number: DS21212
    Backplane Rev: 
    Backplane Serial Number: 792XXXXXXXXX

 

node-2: 

NetApp Release 9.14.1P6: Tue Jun 18 12:11:44 EDT 2024
    System ID: 0123456789 (node-2); partner ID: 0987654321 (node-1)
    System Serial Number: 95XXXXXXXXXX (node-2)
    System Rev: A6
    System Storage Configuration: Mixed-Path HA <<< Before the issue, there is Tri-Path HA 
    System ACP Connectivity: Inband Active
    SAS2/SAS3 Mixed Stack Support: all
    All-Flash Optimized: false
    Capacity Optimized: false
 All SAN Array: false
    Backplane Part Number: DS21212
    Backplane Rev: 
    Backplane Serial Number: 792XXXXXXXXX

 

  • Upon checking the environment, the SAS cable [7] connected to node-2 appears to be disconnected and shows a status of <N/A>.

 SAS cable information by element:
   [1] Internal connector
   [2] Internal connector
   [3] Vendor: Molex Inc.
       Type: MINI-SAS HD passive copper 2m  ID: 00  Swaps: 0
       Serial number: 123456789  Part number: 112-00437+A0
   [4] Vendor: <N/A> (disconnected)
       Type: <N/A> <N/A> <N/A>  ID: <N/A>  Swaps: 0
       Serial number: <N/A>  Part number: <N/A>
   [5] Internal connector
   [6] Internal connector
   [7] Vendor: <N/A> (disconnected)　
       Type: <N/A> <N/A> <N/A>  ID: <N/A>  Swaps: 0
       Serial number: <N/A>  Part number: <N/A>
   [8] Vendor: <N/A> (disconnected)
       Type: <N/A> <N/A> <N/A>  ID: <N/A>  Swaps: 0
       Serial number: <N/A>  Part number: <N/A>

  • Before disconnected, the vendor name and type are displayed correctly.

    SAS cable information by element:
      [1] Internal connector
      [2] Internal connector
      [3] Vendor: Molex Inc.
          Type: MINI-SAS HD passive copper 2m  ID: 00  Swaps: 0
          Serial number: 123456789  Part number: 112-00437+A0
      [4] Vendor: <N/A> (disconnected)
          Type: <N/A> <N/A> <N/A>  ID: <N/A>  Swaps: 0
          Serial number: <N/A>  Part number: <N/A>
      [5] Internal connector
      [6] Internal connector
      [7] Vendor: Amphenol
          Type: MINI-SAS HD passive copper 0.5-1.0m  ID: 01  Swaps: 0
          Serial number: APF12345678901  Part number: 112-00435+A0
      [8] Vendor: <N/A> (disconnected)
          Type: <N/A> <N/A> <N/A>  ID: <N/A>  Swaps: 0
          Serial number: <N/A>  Part number: <N/A>
    ACP installed element list: 1, 2; with error: none

  • SAS ports [3] and [4] on FAS2820 controller A are designated as 0b1 and 0b2 ports, respectively. 
  • Similarly, on FAS2820 controller B, ports [7] and [8] are designated as 0b1 and 0b2 ports.

 

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