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    • What does ONTAP do with available IDLE cycles on the storage controller?
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/What_does_ONTAP_do_with_available_IDLE_cycles_on_the_storage_controller
      ONTAP is opportunistic, when there are available IDLE CPU cycles (IDLE time), instead of wasting the IDLE time, ONTAP can and will use as much of the available time as possible to run background and s...ONTAP is opportunistic, when there are available IDLE CPU cycles (IDLE time), instead of wasting the IDLE time, ONTAP can and will use as much of the available time as possible to run background and scheduled tasks such as: This increased latency is expected since the storage system becomes busy with work it is doing in the background (by design), when the work is complete, utilization and latency can drop back to the normal levels.
    • High CVO nvlog latency due to overutilized disks
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/High_CVO_nvlog_latency_due_to_overutilized_disks
      Applies to ONTAP 9 Cloud Volumes ONTAP (CVO) Issue High NVLOG latency is seen Looking at disks, there may be i/o queued but statit will show high latencies
    • High sustained latency after ONTAP upgrade to 9.8 and above due to FPolicy EAGAIN
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/High_sustained_latency_after_ONTAP_upgrade_to_9.8_and_above_due_to_FPolicy_EAGAIN
      Applies to ONTAP 9 CIFS / NFS protocols FPolicy Issue High sustained latency after ONTAP upgrade to 9.8 and degradation on multiple shares or exports Disable Fpolicy resolves unexpected high latency E...Applies to ONTAP 9 CIFS / NFS protocols FPolicy Issue High sustained latency after ONTAP upgrade to 9.8 and degradation on multiple shares or exports Disable Fpolicy resolves unexpected high latency Ensure each node has a LIF per VServer and fix any connection issues with ONTAP and the FPolicy server
    • High CPU HOST OS CSM-BTLS Slow SnapMirror on FAS2500 ONTAP 9.6 or higher
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/High_CPU_HOST_OS_CSM-BTLS_Slow_SnapMirror_on_FAS2500_ONTAP_9.6_or_higher
      High CPU in HOST domain, viewing TOP-BS from Weekly AutoSupports in Active IQ shows top consumer is CSM BTLS PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 2402 root 1 -16 - 0K 20K CPU3 ...High CPU in HOST domain, viewing TOP-BS from Weekly AutoSupports in Active IQ shows top consumer is CSM BTLS PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 2402 root 1 -16 - 0K 20K CPU3 3 39.0H 74.76% CSM BTLS 2404 root 1 -16 - 0K 20K CPU0 0 39.0H 73.58% CSM BTLS 2401 root 1 -16 - 0K 20K RUN 0 38.9H 73.49% CSM BTLS 2403 root 1 -16 - 0K 20K CPU2 2 38.9H 72.61% CSM BTLS
    • net.cg.utilThresholdExceed: Connection group utilization exceeds configured threshold
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/net_cg_utilThresholdExceed__Connection_group_utilization_exceeds_configured_threshold
      Applies to ONTAP 9.8 and newer CIFS iSCSI Issue Event logs or EMS: net.cg.utilThresholdExceed: Connection group utilization ( ) exceeds configured threshold (95%)
    • How do I know if CPU is causing a performance issue?
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/How_do_I_know_if_CPU_is_causing_a_performance_issue
      Is High CPU utilization causing a performance issue? Looking at the Cluster Components, the two main CPU resources are: If these two components make up the majority of your latency, then CPU is the pr...Is High CPU utilization causing a performance issue? Looking at the Cluster Components, the two main CPU resources are: If these two components make up the majority of your latency, then CPU is the primary factor in overall latency. In most AFF systems, CPU is the primary contributor to latency. It would be a 'problem' only if the latency seen is higher than expected. As with UM, if these two components comprise the majority of latency, then CPU is the primary factor in overall latency
    • Latency increases suddenly while using QoS - Resolution Guide
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Latency_increases_suddenly_while_using_QoS_-_Resolution_Guide
      When using a QoS policy, QoS latency will suddenly increase Network Exempt utilization - CPU processing for protocol ops - will increase. Users may report intermittent slowness/latency issue whenever ...When using a QoS policy, QoS latency will suddenly increase Network Exempt utilization - CPU processing for protocol ops - will increase. Users may report intermittent slowness/latency issue whenever QOS max limit is reached, due to the saturated Network Exempt processing domain. Delay from Network Processing, also called CPU N-Blade or Network Exempt (Nwk_Exmpt) Performing any test (like running dd commands) on the client end report high latency due to bursty workload in nature.
    • ONTAP 9 Performance - Resolution Guide
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/ONTAP_9_Performance_Resolution_Guide
      This is ONTAP 9 performance resolution guide, which is a starting point for understanding where a performance problem might originate, and also take the help of other related articles which help in re...This is ONTAP 9 performance resolution guide, which is a starting point for understanding where a performance problem might originate, and also take the help of other related articles which help in resolving the issue.
    • Slow iSCSI throughput on ESX with Intel XL710 NICs
      https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/Slow_iSCSI_throughput_on_ESX_with_Intel_XL710_NICs
      Applies to All NetApp products ESXi 6.5 and higher iSCSI connectivity Issue There may be slow or inconsistent throughput with VMs on iSCSI datastores Pause frames may be seen if flowcontrol is enabled...Applies to All NetApp products ESXi 6.5 and higher iSCSI connectivity Issue There may be slow or inconsistent throughput with VMs on iSCSI datastores Pause frames may be seen if flowcontrol is enabled Throughput may be up and down, but no packet loss or obvious TCP delays are seen.
    • Disconnects logged on SAN application due to poor performance in ONTAP
      https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/Disconnects_logged_on_SAN_application_due_to_poor_performance_in_ONTAP
      Applies to ONTAP 9 iSCSI networks FCP networks Issue Application monitoring may show The controller system device has disconnected all target ports to the cluster (system) nodes There are disconnects ...Applies to ONTAP 9 iSCSI networks FCP networks Issue Application monitoring may show The controller system device has disconnected all target ports to the cluster (system) nodes There are disconnects logged and EMS errors such as the following are seen: Sun Apr 25 14:09:42 -0500 [Node1: fct_tpd_work_thread_0: fcp.io.status:debug]: STIO Adapter:10b IO WQE failure, Handle 0x3, Type 8, S_ID: 0, VPI: 0, OX_ID: 220, Status 0x3 Ext_Status 0x4
    • How are FAS nodes, mounts, and aggregates segregated in HA pairs?
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/How_are_FAS_nodes_mounts_and_aggregates_segregated_in_HA_pairs
      HA Pairs have two separate nodes, on two separate motherboards, that only share same disks Each node creates groups of disks called Aggregates, which contain FlexVols that are mounted over CIFS, FCP, ...HA Pairs have two separate nodes, on two separate motherboards, that only share same disks Each node creates groups of disks called Aggregates, which contain FlexVols that are mounted over CIFS, FCP, iSCSI, or NFS To utilize the resources of both nodes, talk to your account team about setting up a FlexGroup or using multiple LUNs striped as a volume group on the host side. Technical Report: NetApp ONTAP FlexGroup Volumes Best Practices and Implementation Guide