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Drive Bypassed Causing Controller to Enter a Mixed-Path State

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Applies to

  • I/O module (IOM) - 3
  • I/O module (IOM) - 6
  • I/O module (IOM) - 12
  • I/O embed module (IOM-E)
  • ONTAP 9

Issue

  • Disk is bypassed and goes missing from SYSCONFIG -A output.
  • EMS error example:

Mon Nov 23 14:43:22 CET [node1: dsa_worker4: ds.sas.hostphy.disableErr:critical]: [  7 ] on channels 0b shelf id 22 IOM B Disabled due to excessive invalid dword error.

  • SAS-EXPANDER-PHY-STATE, drive reports Disabled/[reason]. Example:

    Expander phy state on 0b.22 (NETAPP  :DS224IOM6        1200345678): 
                                  Pwr         Invald Disprt Loss   Phy    CRC    Phy                    
                              Pwr Ccl Rsv Rls DWord  Error  Sync   Reset  Error  Change SATA            
    PHY/BAY STATE             ON  Cnt Cnt Cnt Count  Count  Count  Prob   Cnt    Cnt    Affiliation     
    ------- ----------------- --- --- --- --- ------ ------ ------ ------ ------ ------ ----------------
    15/7    Disabled/IDD      YES 0   0   0  
    21/13   Disabled/BRST_PCD YES 3   0   0  

  • Mixed-Path storage system state example:
::>system node run -node <nodename> -command sysconfig -a
NetApp Release 9.5P2: Thu Mar 14 10:01:49 EDT 2019
        System ID: 0123456789 (NODE-01); partner ID: 0123456788 (NODE-02)
        System Serial Number: 0123456789012 (NODE-01)
        System Rev: A4
        System Storage Configuration: Mixed-Path
        ...

 

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