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    • How to troubleshoot NFS APD issues on VMware ESXi
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/How_to_troubleshoot_NFS_APD_issues_on_VMware_ESXi
      An all paths down (APD) timer is started when there has been a 5 second period with no communcation on any given TCP stream After 140 seconds of being in this state, the connection is considered lost ...An all paths down (APD) timer is started when there has been a 5 second period with no communcation on any given TCP stream After 140 seconds of being in this state, the connection is considered lost and an APD timeout is reached YYYY-MM-DD T00:26:51.504Z: [APDCorrelator] xxxxxxxxxxxxxus: [esx.problem.storage.apd.timeout] Device or filesystem with identifier [xxxxxxxx-xxxxxxxx] has entered the All Paths Down Timeout state after being in the All Paths Down state for 140 seconds.
    • Disruption during EOS upgrade on 2 nodes cluster
      https://kb.netapp.com/Legacy/NetApp_HCI/OS/Disruption_during_EOS_upgrade_on_2_nodes_cluster
      Applies to NetApp HCI 2 or 3 storage nodes cluster Witness Node Issue Datastores lose access to storage system while upgrade on storage node is in progress. In some cases, theres no volumeoffline aler...Applies to NetApp HCI 2 or 3 storage nodes cluster Witness Node Issue Datastores lose access to storage system while upgrade on storage node is in progress. In some cases, theres no volumeoffline alert
    • ESXi datastores not accessible with error "device entered the All Paths Down state"
      https://kb.netapp.com/hybrid/FlexPod/ESXi_datastores_not_accessible_with_error_device_entered_the_All_Paths_Down_state
      [APDCorrelator]:[vob.storage.apd.start] Device or filesystem with identifier [x] has entered the All Paths Down state. [APDCorrelator]:[esx.problem.storage.apd.start] Device or filesystem with identif...[APDCorrelator]:[vob.storage.apd.start] Device or filesystem with identifier [x] has entered the All Paths Down state. [APDCorrelator]:[esx.problem.storage.apd.start] Device or filesystem with identifier [x] has entered the All Paths Down state. The target virtual port is: 'NetApp FC Target Port (LPe32000) ushoxxtor1011-EsxVxi:ushoxxtor10-0x_fx_lif_1'. Below steps can be verified that might trigger the APD state of the storage device:
    • E-Series extreme performance degradation with timeouts on ATS operations with large VMware clusters
      https://kb.netapp.com/on-prem/E-Series/Hardware-KBs/E-Series_extreme_performance_degradation__with_timeouts_on_ATS_operations_with_large_VMware_clusters
      Applies to NetApp E-Series E2600 E2700 E2800 & EF280 E5400 & EF540 E5500 & EF550 E5600 & EF560 E5700 & EF570 VMware Cluster VMware vSphere VMware ESXi 6.0 (Update 3) Issue In large VMware clusters usi...Applies to NetApp E-Series E2600 E2700 E2800 & EF280 E5400 & EF540 E5500 & EF550 E5600 & EF560 E5700 & EF570 VMware Cluster VMware vSphere VMware ESXi 6.0 (Update 3) Issue In large VMware clusters using E-Series controllers with firmware SANtricity OS 11.40R1 or 8.40.00.01 May experience performance degradation Virtual servers may randomly reboot VMware may report Timeouts with ATS operations Reservation conflicts messages
    • After enabling space-allocation raw device mapping has all paths down
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/After_enabling_space-allocation_raw_device_mapping_has_all_paths_down
      After setting a LUN offline and online(to enable space_allocation), all related paths stay down in one of two ESXi hosts Windows disk was offlined within the Microsoft cluster node which is a virtual ...After setting a LUN offline and online(to enable space_allocation), all related paths stay down in one of two ESXi hosts Windows disk was offlined within the Microsoft cluster node which is a virtual machine (VM) before the procedure but not ESXi The other host with the VM cluster node still attaching the RDM in question has no access issues. esxcli storage core device list still contains the LUN esxcli storage core device world list displays the VM name with the NAA of the LUN in question