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    • https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/How_to_troubleshoot_optical_SAS_cable_issues
      Applies to Streched MetroCluster ONTAP 9 ONTAP 8 Description This article describes how to troubleshoot optical SAS cable issues
    • https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/Unable_to_upgrade_2-node_MetroCluster_due_to_Data_ONTAP_version_mismatch
      Applies to ONTAP 9 ONTAP upgrade 2-node MetroCluster Issue When upgrading a 2-node MetroCluster to a new ONTAP version, Switchover fails with the following error message: Error: command failed: Unable...Applies to ONTAP 9 ONTAP upgrade 2-node MetroCluster Issue When upgrading a 2-node MetroCluster to a new ONTAP version, Switchover fails with the following error message: Error: command failed: Unable to perform the MetroCluster operation because of a Data ONTAP version mismatch. All nodes in a MetroCluster configuration must have the same version for both the current and default images. Upgrade or revert nodes as needed, then try the command again.
    • https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/Individual_PHYs_disabled_in_a_SAS_port_using_optical_cables
      ::> run -node <node_name> -command sysconfig -a slot 0: SAS Host Adapter 0a (PMC-Sierra PM8001 rev. C, SAS, <UP>) Phy State: [0] Disabled QSFP Type: Optical (850nm VCSEL) 0m ID:00 ::> run -node local ...::> run -node <node_name> -command sysconfig -a slot 0: SAS Host Adapter 0a (PMC-Sierra PM8001 rev. C, SAS, <UP>) Phy State: [0] Disabled QSFP Type: Optical (850nm VCSEL) 0m ID:00 ::> run -node local -command storage show shelf -a Shelf UID: 50:0a:09:80:03:8d:5e:87 Shelf state: ONLINE Module state: OK Partial Path Link Invalid Running Loss Phy CRC Phy Disk Port Timeout Rate DWord Disparity Dword Reset Error Change Id State Value (ms) (Gb/s) Count Count Count Problem Count Count