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    • Cluster peer no longer available cpeer.unavailable:ALERT
      https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/Cluster_peer_no_longer_available_cpeer_unavailable_ALERT
      Applies to ONTAP 9 Cluster peering MTU mismatch Network Issue Cluster peer shows unreachable for nodes on one side:
    • 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
    • How to fix MTU inconsistency between replicating clusters with standard frame size interlink
      https://kb.netapp.com/on-prem/solidfire/Element_OS_Kbs/How_to_fix_MTU_inconsistency_between_replicating_clusters_with_standard_frame_size_interlink
      Applies to NetApp Element Software Remote replication Link between clusters on standard MTU Storage clusters on jumbo MTU This article describes how to fix MTU inconsistency respecting the supported m...Applies to NetApp Element Software Remote replication Link between clusters on standard MTU Storage clusters on jumbo MTU This article describes how to fix MTU inconsistency respecting the supported models for remote replication as described in TR-4741 (page 12 and further). Please note on Element software MTU inconsistency is not supported by NetApp. While it is possible the replication may work/have worked under other circumstances, only the scenarios described in TR-4741 are supported.
    • NFSv3 mount hang
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/NFSv3_mount_hang
      Applies to A700 ONTAP 9 Issue If the switch sets the MTU size as 1500, a ping test from the client with an MTU size of 1500 will fail Swithch: MTU 1500 If the switch sets the MTU size as 9192, a ping ...Applies to A700 ONTAP 9 Issue If the switch sets the MTU size as 1500, a ping test from the client with an MTU size of 1500 will fail Swithch: MTU 1500 If the switch sets the MTU size as 9192, a ping test from the client with an MTU size of 1500 will succeed Example: Netapp storage: MTU 1500 Swithch: MTU 9192 Client: MTU 1500
    • 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.
    • Snapmirror initialize fails with CSM:Connection aborted
      https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/Snapmirror_initialize_fails_with_CSM_Connection_aborted
      Applies to ONTAP 9 SnapMirror Issue Snapmirror initialize fails with CSM:Connection aborted error Example: Destination_cluster::> snapmirror initialize -destination-path dst_vserver_name:dst_vol_name ...Applies to ONTAP 9 SnapMirror Issue Snapmirror initialize fails with CSM:Connection aborted error Example: Destination_cluster::> snapmirror initialize -destination-path dst_vserver_name:dst_vol_name Error: command failed: Failed to get information for source volume "src_vserver_name:src_vol_name" for confirmation. (CSM: Connection aborted.)
    • vifmgr.cluscheck.crcerrors alerts and ifstat receiving long frames due to MTU mismatch
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/vifmgr.cluscheck.crcerrors_alerts_and_ifstat_receiving_long_frames_due_to_MTU_mismatch
      The article offers a resolution for the scenario where long frames are observed in the ifstat output and an alert is triggered for vifmgr.cluscheck.crcerrors.
    • The mounting process is hanging or the volume access is very slow
      https://kb.netapp.com/on-prem/ontap/ontap-select/Select-KBs/The_mounting_process_is_hanging_or_the_volume_access_is_very_slow
      Applies to ONTAP Select 9.13.1 Issue VMs are mounting NFS volumes that are provisioned by the ONTAP select NFS access is unstable: The mounting process is hanging The volume access is very slow