Drive Bypassed Causing Controller to Enter a Mixed-Path State

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
        ...