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    • SAS port has disabled PHY
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/SAS_port_has_disabled_PHY
      SAS port on controller has disabled PHY with alert in ‘system health alert show’, which could be caused due to multiple potential causes. KB article provides steps to resolve this issue, if the system...SAS port on controller has disabled PHY with alert in ‘system health alert show’, which could be caused due to multiple potential causes. KB article provides steps to resolve this issue, if the system is in Multi-Path configuration.
    • SAS adapter port PHYs disabled all except one after shelf added
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/SAS_adapter_port_PHYs_disabled_all_except_one_after_shelf_added
      [Node-01: disk_server_0: disk.ioMediumError:notice]: Medium error on disk 0b.62.3: op 0x28:00000010:0008 sector 16 SCSI:medium error - Unrecovered read error - If the disk is in a RAID group, the subs...[Node-01: disk_server_0: disk.ioMediumError:notice]: Medium error on disk 0b.62.3: op 0x28:00000010:0008 sector 16 SCSI:medium error - Unrecovered read error - If the disk is in a RAID group, the subsystem will attempt to reconstruct unreadable data (3 11 ff 0) (4492) Disk 0b.62.3 Shelf 62 Bay 3 [NETAPP X356_TPM4V3T8AME NA03] S/N [XXXXXXXXXXXX] UID [50000397:9C902830:00000000:00000000:00000000:00000000:00000000:00000000:00000000:00000000]
    • One or more (1) PHYs on expander are in a bad state after shelf replacement
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/One_or_more_1_PHYs_on_expander_are_in_a_bad_state_after_shelf_replacement
      16:03:27 Filer-02 INFORMATIONAL sas.adapter.debug: adapterName="0a", debug_string="WRONG destination on OPEN (0x17) -- delaying: dev 0a.01.0, cdb 0x2f:22ea3200:0400 (0/164965), NDU 0x0" 16:03:38 Filer...16:03:27 Filer-02 INFORMATIONAL sas.adapter.debug: adapterName="0a", debug_string="WRONG destination on OPEN (0x17) -- delaying: dev 0a.01.0, cdb 0x2f:22ea3200:0400 (0/164965), NDU 0x0" 16:03:38 Filer-02 INFORMATIONAL sas.adapter.debug: adapterName="0a", debug_string="WRONG destination on OPEN (0x17) -- delaying: dev 0a.01.0, cdb 0x2a:29ef0168:0088 (0/7), NDU 0x0"