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    • https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Latency_from_CPU_protocol_for_extremely_bursty_SAN_workloads
      Breakdown of the latency shows high latency on Network & Protocol processing, this could be observed in various ways: Command Line: qos statistics workload latency show or qos statistics volume latenc...Breakdown of the latency shows high latency on Network & Protocol processing, this could be observed in various ways: Command Line: qos statistics workload latency show or qos statistics volume latency show has the latency from Network The high latency from CPU_protocol/Network is observed when there is no CPU contention in SAN processing CPU Domains, such as SSAN_Ex.
    • https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/Outage_due_to_broadcast_storm_that_impacted_cluster_services
      [node-01: dsa_worker3: ses.status.electronicsWarn:error]: FS4483PSM3E (S/N SHFNC2211000123) shelf 0 on channel 0s environmental monitoring warning for SES electronics 2: communication error. ; enclosu...[node-01: dsa_worker3: ses.status.electronicsWarn:error]: FS4483PSM3E (S/N SHFNC2211000123) shelf 0 on channel 0s environmental monitoring warning for SES electronics 2: communication error. ; enclosure services hardware failed This element is on the rear of the shelf at the bottom, on shelf module (B). [node-01: dsa_worker3: ses.status.ModuleError:alert]: FS4483PSM3E (S/N SHFNC2211000123) shelf 0 on channel 0s PCI switch error for PCI Switch 2: status not available; status not available.
    • https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Bursty_write_append_workloads_impacting_write_latency_on_AFF
      Applies to ONTAP 9 AFF platforms Linux Issue Increased write latency / write latency higher than expected Review of QoS statistics volume latency show output has majority of latency in "data" column R...Applies to ONTAP 9 AFF platforms Linux Issue Increased write latency / write latency higher than expected Review of QoS statistics volume latency show output has majority of latency in "data" column Review of Unified Manager or NetApp Harvest shows increased write latency Applications that write append files in periodic large batches or bursts may experience a logical processing bottleneck
    • https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/How_to_identify_transient_workload_bursts_using_sysstat_command
      These averages can not represent the real resource bottlenecks during the bursts, thus in some cases, a more granular data collection is needed to better understand the throughpout, CPU scheduling and...These averages can not represent the real resource bottlenecks during the bursts, thus in some cases, a more granular data collection is needed to better understand the throughpout, CPU scheduling and CP behaviors. This article describes a method to detect those transient workload spikes using sysstat command, especially those short bursts that only last for hundreds of milliseconds, or even just tens of milliseconds.