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    • NFS mount hung after attempting a READ, WRITE or other operation with a large payload
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/NFS_mount_hung_after_attempting_a_READ_WRITE_or_other_operation_with_a_large_payload
      Applies to ONTAP 9 Issue NFS export is mounted without any issues Small READ and WRITE operations succeed Large READ and WRITE operations can cause the mount to hang Other operations which are not sma...Applies to ONTAP 9 Issue NFS export is mounted without any issues Small READ and WRITE operations succeed Large READ and WRITE operations can cause the mount to hang Other operations which are not small enough to fit within a standard MTU (1500 or less) can also cause a hang READDIRs for some directories can return a large result, possibly exceeding the actual MTU of the network path, and causing a hang
    • E-Series iSCSI Asynchronous Mirroring performance not as per expectation
      https://kb.netapp.com/on-prem/E-Series/Hardware-KBs/E-Series_iSCSI_Asynchronous_Mirroring_performance_not_as_per_expectation
      Applies to All E and EF-Series storage array with iSCSI asynchronous mirror replication Issue Not utilizing the entire network bandwidth via a dedicated link when performing asynchronous mirroring as ...Applies to All E and EF-Series storage array with iSCSI asynchronous mirror replication Issue Not utilizing the entire network bandwidth via a dedicated link when performing asynchronous mirroring as per customer's expectations.
    • Failed to add a cluster to ActiveIQ UM because of network issues
      https://kb.netapp.com/data-mgmt/AIQUM/AIQUM_Kbs/Failed_to_add_a_cluster_to_ActiveIQ_UM_because_of_network_issues
      Adding a cluster to UM fails with error Unable to add cluster data source. This can occur if the clocks on the systems are not synchronized and the Active IQ Unified Manager HTTPS certificate start da...Adding a cluster to UM fails with error Unable to add cluster data source. This can occur if the clocks on the systems are not synchronized and the Active IQ Unified Manager HTTPS certificate start date is later than the date on the cluster, or if the cluster has reached the maximum number of EMS notification destinations. The error is not related to NTP or time issues The error is not related to the HTTPS certificate The error is not related to the maximum number of EMS notifications
    • Cannot set MTU for network port in ONTAP System Manager
      https://kb.netapp.com/on-prem/ontap/DM/System_Manager/SM-KBs/Cannot_set_MTU_for_network_port_in_ONTAP_System_Manager
      System Manager in ONTAP 9.8 and later does not provide the ability to change the maximum transmission unit (MTU) size for a network port Run the following CLI command to modify the MTU for a network p...System Manager in ONTAP 9.8 and later does not provide the ability to change the maximum transmission unit (MTU) size for a network port Run the following CLI command to modify the MTU for a network port. Changing the MTU value will affect all ports in the broadcast domain: network port broadcast-domain modify -ipspace <IPspace> -broadcast-domain <broadcast-domain> -mtu <new_value> How to adjust the MTU for an ONTAP interface Check the MTU network setting on the storage system
    • Check jumbo frame connectivity over iSCSI lif
      https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/Check_jumbo_frame_connectivity_over_iSCSI_lif
      Applies to • Data OnTap 9 • iSCSI Issue Packet fragmentation when using jumbo frames over iSCSI
    • ClusterDeployFailed because of unsupported MTU Size
      https://kb.netapp.com/on-prem/ontap/ontap-select/Select-KBs/ClusterDeployFailed_because_of_unsupported_MTU_Size
      Applies to NetApp ONTAP Select Deploy NetApp ONTAP Select Issue Deployment of a multinode ONTAP Select cluster fails with ONTAPClusterCreateJoinOperationFailed
    • Create VMFS datastore failed: cannot change the host configuration
      https://kb.netapp.com/Legacy/NetApp_HCI/OS/Create_VMFS_datastore_failed__cannot_change_the_host_configuration
      Applies to ESXi hosts connecting to Element storage nodes H series compute nodes non-NetApp ESXi compute hosts SF Series storage nodes H Series storage nodes Issue Unable to create or modify existing ...Applies to ESXi hosts connecting to Element storage nodes H series compute nodes non-NetApp ESXi compute hosts SF Series storage nodes H Series storage nodes Issue Unable to create or modify existing datastores on Element Software volumes, giving the following messages: Cannot change the host configuration Create VMFS datastore failed: “cannot change the host configuration"
    • ONTAP Select Deployment Fails with "ClusterDeployFailed"
      https://kb.netapp.com/on-prem/ontap/ontap-select/Select-KBs/ONTAP_Select_Deployment_Fails_with_ClusterDeployFailed
      Applies to ONTAP Select ONTAP Deploy Issue Deploying a ONTAP Select HA fails with: ClusterDeployFailed error with the message"StorageFailoverNotEnabled: Either Storage Failover or Cluster HA is not en...Applies to ONTAP Select ONTAP Deploy Issue Deploying a ONTAP Select HA fails with: ClusterDeployFailed error with the message"StorageFailoverNotEnabled: Either Storage Failover or Cluster HA is not enabled for cluster
    • ESXi datastores are unavailable after network switch migration
      https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/ESXi_datastores_are_unavailable_after_network_switch_migration
      Applies to Data ONTAP 9 iSCSI VMware Issue After migrating to a new Nexus 5K switch the ESXi hosts lost connectivity to their LUNs. Datastores show unavailable.
    • Switchback failing - the online status of the replication units in the cluster could not be verified
      https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/Switchback_failing_-_the_online_status_of_the_replication_units_in_the_cluster_could_not_be_verified
      Errors: Failed to set up the node and cluster components for the switchback operation. ClusterA (fatal): The MetroCluster DR operation was terminated because the online status of the replication units...Errors: Failed to set up the node and cluster components for the switchback operation. ClusterA (fatal): The MetroCluster DR operation was terminated because the online status of the replication units in the cluster could not be verified. Run the (privilege: advanced) "cluster ring show" command to display the status of the replication units. Try the MetroCluster DR operation again when each replication unit's "online" field shows either "master" or "secondary".
    • Is it possible to change the MTU post install on NetApp HCI Systems?
      https://kb.netapp.com/on-prem/solidfire/Element_OS_Kbs/Is_it_possible_to_change_the_MTU_post_install_on_NetApp_HCI_Systems
      Applies to NetApp HCI NetApp Deployment Engine (NDE) Maximum Transmission Unit (MTU) Additional Information The MTU size setting on all HCI nodes can be changed to the default 1500 value after NetApp ...Applies to NetApp HCI NetApp Deployment Engine (NDE) Maximum Transmission Unit (MTU) Additional Information The MTU size setting on all HCI nodes can be changed to the default 1500 value after NetApp Deployment Engine (NDE) has completed deploying the system, however, it is not supported by NDE itself. If the MTU size setting were to be changed to 1500, NDE's EasyScale utility would not be able to add new compute or storage nodes to existing VMware ESXi or NetApp Element Software clusters.