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- https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/High_latency_on_database_log_volumesApplies to ONTAP Issue High latency in a database environment reported against the controller NetApp Unified Manager Insight etc. This article only applies to situations where the controller is report...Applies to ONTAP Issue High latency in a database environment reported against the controller NetApp Unified Manager Insight etc. This article only applies to situations where the controller is reporting high latency for database logging volumes/LUNs
- https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/How_to_collect_a_Perfstat_from_clustered_Data_ONTAP_systems_using_the_Perfstat_GUIThis document provides information about the Perfstat 8.4 GUI tool and the procedure that should be followed to collect performance data using the tool. Run Perfstat from a physical host or a VM not a...This document provides information about the Perfstat 8.4 GUI tool and the procedure that should be followed to collect performance data using the tool. Run Perfstat from a physical host or a VM not associated with the cluster being collected against. Collection host should be on the same network as the cluster, avoid a lot of network hops or latency between host and cluster. The Perfstat application and related output files should only be stored on the local disk of the collection host.
- https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/How_to_collect_a_Perfstat_from_a_clustered_Data_ONTAP_system_in_Mac_OS_XApplies to Perfstat 8.3 for Mac OS X Clustered Data ONTAP 8.3 Description This article describes the procedure that should be followed to set up and collect a Perfstat from a clustered Data ONTAP syst...Applies to Perfstat 8.3 for Mac OS X Clustered Data ONTAP 8.3 Description This article describes the procedure that should be followed to set up and collect a Perfstat from a clustered Data ONTAP system in Mac OS X.
- https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/How_to_Assess_Disk_Response_Times_in_ONTAPApplies to ONTAP 9 Data ONTAP 7-Mode Description This article describes how to use the statit command and the different columns to understand disk utilization, latency, and operation size.
- https://kb.netapp.com/Cloud/Cloud_Volumes_ONTAP/Azure_Cloud_Volumes_ONTAP_-_SVM_Data_LIF_connectivity_problems_-_Resolution_GuideCloud Volumes ONTAP helps troubleshoot high disk utilization or latency in ONTAP. Latency is shown in the Disk or Aggregate Processing (Active IQ Unified Manager), and latency actively impacts the ta...Cloud Volumes ONTAP helps troubleshoot high disk utilization or latency in ONTAP. Latency is shown in the Disk or Aggregate Processing (Active IQ Unified Manager), and latency actively impacts the target volume.
- https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Slow_VM_Clone_using_SCE_caused_by_long_suspensions_on_COPY_WAITVM Clone using SIS-Clone Copy Engine (SCE) should be very fast as it does not involve any real data copy. But on ONTAP 9.5, it has been observed that SCE performance is degraded and it only provides a...VM Clone using SIS-Clone Copy Engine (SCE) should be very fast as it does not involve any real data copy. But on ONTAP 9.5, it has been observed that SCE performance is degraded and it only provides a similar throughput as Block Copy Engine(BCE). The majority of the delay comes from a long suspension on COPY_WAIT. Note: In this case, average Suspend time on COPY_WAIT is about 120.78ms. The WAFL suspension stats could be viewed from any Perfstats, or collected in a manual way:
- https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/What_is_the_theoretical_maximum_throughput_of_a_Gigabit_Ethernet_interfaceIn this article, Megabit is 1024 x 1024 bits, not 1000 x 1000 bits Note: Preamble and Inter-frame gap are not part of the actual frame itself but add 16 bytes (128 bits) to the beginning and must be f...In this article, Megabit is 1024 x 1024 bits, not 1000 x 1000 bits Note: Preamble and Inter-frame gap are not part of the actual frame itself but add 16 bytes (128 bits) to the beginning and must be factored in calculations How is maximum throughput calculated for jumbo MTU (9000 byte) frames and the TCP overhead The approximate throughput for Gigabit Ethernet without jumbo frames and using TCP is around 928Mbps or 116MB/s
- https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Zombie_exhaustion_accounting_for_poor_delete_performanceApplies to ONTAP 9 Issue ONTAP 9 or newer releases, you may see this message: wafl.zombie.susp.msg.threshold:notice]: WAFL(R) is experiencing zombie throttling possibly due to requests for large numbe...Applies to ONTAP 9 Issue ONTAP 9 or newer releases, you may see this message: wafl.zombie.susp.msg.threshold:notice]: WAFL(R) is experiencing zombie throttling possibly due to requests for large number of file deletions. High response time for CIFS or NFS trying to open files, overwrite files, or delete files CPU utilization might be higher than normal
- https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Cloud_Volumes_ONTAP_NVlog_transfer_bottleneck_-_Resolution_GuideCloud Volumes ONTAP has some architectural differences compared to on-premises FAS/AFF that may lead to the NVlogging component of ONTAP becoming a performance bottleneck -total- - 136.49ms 99.00us 70...Cloud Volumes ONTAP has some architectural differences compared to on-premises FAS/AFF that may lead to the NVlogging component of ONTAP becoming a performance bottleneck -total- - 136.49ms 99.00us 70.00us 550.00us 153.00us 0ms 136.17ms vserver5_vol8.. 7704 177.54ms 351.00us 1.00us 834.00us 114.00us 0ms 176.33ms -total- - 140.29ms 103.00us 75.00us 335.56us 174.00us 0ms 139.94ms vserver5_vol8.. 7704 253.02ms 309.00us 1.30us 820.00us 105.00us 0ms 251.37ms
- https://kb.netapp.com/Cloud/Cloud_Volumes_ONTAP/Cloud_Volumes_ONTAP_-_Disk_utilization_and_latency_-_Resolution_GuideCloud Volumes ONTAP helps troubleshoot high disk utilization or latency in ONTAP. Latency is shown in the Disk or Aggregate Processing (Active IQ Unified Manager), and latency actively impacts the ta...Cloud Volumes ONTAP helps troubleshoot high disk utilization or latency in ONTAP. Latency is shown in the Disk or Aggregate Processing (Active IQ Unified Manager), and latency actively impacts the target volume.
- https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Latency_when_FlexShare_is_enabledApplies to Data ONTAP 7-mode Issue High latency for any protocol CIFS/FCP/iSCSI/NFS and no obvious disk/CPU bottleneck Low write workload but yet had deferred back-to-back CPs.
