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    • Direct Attach support for Stretch MetroCluster Configuration with NetApp E-Series array
      https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/Direct_Attach_support_for_Stretch_MetroCluster_Configuration_with_NetApp_E-Series_array
      Stretch MetroCluster with both NetApp E-Series Array LUNs and NetApp native disks where NetApp Native Disks are connected via Optical SAS cables. Stretch MetroCluster with both NetApp E-Series Array L...Stretch MetroCluster with both NetApp E-Series Array LUNs and NetApp native disks where NetApp Native Disks are connected via Optical SAS cables. Stretch MetroCluster with both NetApp E-Series Array LUNs and NetApp native disks where NetApp Native Disks are connected via FC to SAS bridges. In a stretch MetroCluster configuration with NetApp E-Series Array LUNs, you must cable each controller's HBA ports to target ports on the corresponding NetApp E-Series Array Controllers.
    • How to troubleshoot optical SAS cable issues?
      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
    • How to configure MAPS for MetroCluster Brocade backend switches
      https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/How_to_configure_MAPS_for_MetroCluster_Brocade_backend_switches
      Brocade Fabric Switches The Monitoring and Alerting Policy Suite (MAPS) is a storage area network (SAN) health monitor supported on all switches running Fabric OS 7.2.0 or later. Monitoring SAN switch...Brocade Fabric Switches The Monitoring and Alerting Policy Suite (MAPS) is a storage area network (SAN) health monitor supported on all switches running Fabric OS 7.2.0 or later. Monitoring SAN switches enables early fault detection and isolation as well as permitting performance measurements. Within a MetroCluster backend only certain options provided by MAPS are supported. The below samples show snmp and email notification (no other actions are currently supported).
    • FC-VI/Storage adapter/Host target adapter link does not come online with 16g QLogic card
      https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/FC_VI_Storage_adapter_Host_target_adapter_link_does_not_come_online_with_16g_QLogic_card
      QLogic 16g capable card (X1928,X1143A) The link does not come online, however, it is seen as In_Sync on the switch (example of an FC-VI card): 0 0 050000 id 16G In_Sync FC <-- QLogic port 1 1 050100 i...QLogic 16g capable card (X1928,X1143A) The link does not come online, however, it is seen as In_Sync on the switch (example of an FC-VI card): 0 0 050000 id 16G In_Sync FC <-- QLogic port 1 1 050100 id 8G Online FC F-Port 50:0a:09:82:03:6a:c7:c0 2 2 050200 id 8G Online FC F-Port 50:0a:09:83:03:6a:c7:c0 3 3 050300 id 16G In_Sync FC <-- QLogic port 4 4 050400 id 8G Online FC F-Port 50:0a:09:82:03:6a:d5:a0 5 5 050500 id 8G Online FC F-Port 50:0a:09:83:03:6a:d5:a0
    • MetroCluster is configured with 8 paths to disk per node instead of 4
      https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/MetroCluster_is_configured_with_8_paths_to_disk_per_node_instead_of_4
      Applies to MetroCluster FC System configured with 8 paths to each disk per node due to ATTOs using both FC ports and switches using single FC port zoning. Each node in the MetroCluster configuration c...Applies to MetroCluster FC System configured with 8 paths to each disk per node due to ATTOs using both FC ports and switches using single FC port zoning. Each node in the MetroCluster configuration can only support a maximum of 4 paths to disks. ONTAP 9.7 and later ClusterA::> storage show disk -fields path-count -type !LUN ONTAP 9.6 and earlier ClusterA::> storage show disk -fields initiator -nodelist <nodename> -type !LUN disk initiator 1.11.0 3c,3d,3a,3b 1.11.1 3c,3d,3a,3b 1.11.2 3c,3d,3a,3b
    • Can different shelves and IOM modules be mixed in the same stack in a MetroCluster?
      https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/Can_different_shelves_and_IOM_modules_be_mixed_in_the_same_stack_in_a_MetroCluster
      Can different shelves and IOM modules be mixed in the same stack in a MetroCluster? IOM12 and IOM6 can be mixed in the same stack if the ONTAP version supports shelf mixing and dedicated IOM12 and IOM...Can different shelves and IOM modules be mixed in the same stack in a MetroCluster? IOM12 and IOM6 can be mixed in the same stack if the ONTAP version supports shelf mixing and dedicated IOM12 and IOM6 stacks can be created. The shelf models currently allowed to be mixed in a stack are DS2246, DS4243, and DS4246, with only one transition between IOM3 and IOM6. (Check in Hardware Universe for supported modules in an ONTAP release).
    • MetroCluster Config Advisor zoning configuration errors
      https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/MetroCluster_Config_Advisor_zoning_configuration_errors
      Storage zone in fabric for switches contain one or more ports that are not a Storage HBA and not a FibreBridge. Storage zone in fabric for switches are incorrect and contain too many storage initiator...Storage zone in fabric for switches contain one or more ports that are not a Storage HBA and not a FibreBridge. Storage zone in fabric for switches are incorrect and contain too many storage initiator ports. Storage zone in fabric for switches are incorrect and contain not enough storage initiator ports. Storage zone in fabric for switches contain or more ports that are not a Storage initiator and not a target array port.
    • Best Practices for monitoring MetroCluster backend FC Switches using Brocade Network Advisor
      https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/Best_Practices_for_monitoring_MetroCluster_backend_FC_Switches_using_Brocade_Network_Advisor
      ​ ​ ​ Applies to Brocade BNA MetroCluster FC Brocade switches
    • How to troubleshoot "FabricSwitchPowerFail_Alert"?
      https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/How_to_troubleshoot_FabricSwitchPowerFail_Alert
      Applies to MetroCluster FC FabricSwitchPowerFail_Alert Description MetroCluster Health Monitor (FHM) AutoSupport messages are triggered when certain MetroCluster backend switch conditions are detected...Applies to MetroCluster FC FabricSwitchPowerFail_Alert Description MetroCluster Health Monitor (FHM) AutoSupport messages are triggered when certain MetroCluster backend switch conditions are detected. This article explains the cause and necessary actions to resolve these alerts.
    • Send queue of QP WAFL is full events on systems running ONTAP 9.5 and later
      https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/Send_queue_of_QP_WAFL_is_full_events_on_systems_running_ONTAP_9.5_and_later
      Applies to MetroCluster FC (4 node or 8node) FAS9000 or AFF A700 Event log messages rdma.rlib.queue.full:notice]: Send queue of QP WAFL is full. Issue High Availability (HA) Interconnect and Disaster ...Applies to MetroCluster FC (4 node or 8node) FAS9000 or AFF A700 Event log messages rdma.rlib.queue.full:notice]: Send queue of QP WAFL is full. Issue High Availability (HA) Interconnect and Disaster Recovery (DR) interconnect are getting sporadically disabled due to unsyncronized log messages Failover monitor: takeover of CLUSTER2_D by CLUSTER2_C disabled (unsynchronized).
    • SAS Lane on optical SAS cable down due to cross connection
      https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/SAS_Lane_on_optical_SAS_cable_down_due_to_cross_connection
      Applies to Optical SAS Cable Sysconfig -a output shows a SAS Lane as No Signal or unkown slot 2: SAS Host Adapter 2b (PMC-Sierra PM8001 rev. C, SAS, <UP>) MFG Part Number: USI 6086-000010-07 rev. Part...Applies to Optical SAS Cable Sysconfig -a output shows a SAS Lane as No Signal or unkown slot 2: SAS Host Adapter 2b (PMC-Sierra PM8001 rev. C, SAS, <UP>) MFG Part Number: USI 6086-000010-07 rev. Part number: 111-00341+F2 Serial number: ST063C6K048 Phy State: [4] Enabled, 6.0 Gb/s [5] No Signal, n/a <----- Lane is not working correctly [6] Enabled, 6.0 Gb/s QSFP Vendor: Molex Inc. QSFP Part Number: 112-00272+A0 QSFP Type: Optical (1490nm DFB) 5m ID:00 QSFP Serial Number: 93AG13502P0074