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    • ESX Hosts losing access to LUNs regularly along with Aggregate reporting long CP's
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/ESX_Hosts_losing_access_to_LUNs_regularly_along_with_Aggregate_reporting_long_CP_s
      Applies to VMware critical alert for datastore path down Poor performance and alerts for SQL virtual machines Affected datastores: Path redundancy to storage device naa.xyz degraded. Path vmhba1:C0:T7...Applies to VMware critical alert for datastore path down Poor performance and alerts for SQL virtual machines Affected datastores: Path redundancy to storage device naa.xyz degraded. Path vmhba1:C0:T78:L10 is down. ONTAP reports long or back2back consistency points (CP) wafl_exempt00: wafl.cp.toolong:error]: Aggregate_xyz_sata_aggr1 experienced a long CP. I/O latency increased from average value of 8000 microseconds to 1000008 microseconds
    • IOPS and Latency data from VMs are missing in Unified Manager due to duplicate uuids or duplicate SCSI-IDs
      https://kb.netapp.com/data-mgmt/AIQUM/AIQUM_Kbs/IOPS_and_Latency_data_from_VMs_are_missing_in_Unified_Manager_due_to_duplicate_uuids_or_duplicate_SCSI-IDs
      <date> <time> ERROR [pool-3-thread-18080] c.o.u.s.RemoteAppSessionFactory (RemoteAppSessionFactory.java:291) - RemoteAppSessionFactory - Failed to communicate with the server (ejb:mega-app/server-core...<date> <time> ERROR [pool-3-thread-18080] c.o.u.s.RemoteAppSessionFactory (RemoteAppSessionFactory.java:291) - RemoteAppSessionFactory - Failed to communicate with the server (ejb:mega-app/server-core//VMAwareQueryBean!com.netapp.oci.vmware.client.interfaces.remote.VMAwareQueryRemote) - no retries left: java.lang.IllegalStateException: Duplicate key scsi0:0 (attempted merging values com.netapp.oci.vmware.client.data.VMVirtualDiskInstance@<id> and com.netapp.oci.vmware.client.data.VMVirtualDiskI…
    • Some volume performance samples are missing in AIQUM repository database
      https://kb.netapp.com/data-mgmt/AIQUM/AIQUM_Kbs/Some_volume_performance_samples_are_missing_in_AIQUM_repository_database
      Active IQ Unified Manager (AIQUM) 9.10 Some volume performance sample records are missing in sample_qos_volume_workload_<OBJID> table of AIQUM repository database Example: Samples between 5:30 AM and ...Active IQ Unified Manager (AIQUM) 9.10 Some volume performance sample records are missing in sample_qos_volume_workload_<OBJID> table of AIQUM repository database Example: Samples between 5:30 AM and 5:55 are missing -> objId=313 and from_unixtime(time/1000) >= "2022-04-13 5:25:00.0000" order by time; 7 rows in set (0.00 sec) There is no suspicious error or warning in ocum_server.log and au.log Performance recording file includes the volume performance data
    • OCI 7-Mode datasource intermittent gap in IOPS graphs
      https://kb.netapp.com/Legacy/ONTAP/7Mode/OCI_7-Mode_datasource_intermittent_gap_in_IOPS_graphs
      2021-03-18 10:50:13,475 ERROR [com.onaro.sanscreen.acquisition.framework.datasource.BaseDataSource] Datasource [Error connecting] - Failed to connect to ZAPI at: datasource IP, check IP/port connectiv...2021-03-18 10:50:13,475 ERROR [com.onaro.sanscreen.acquisition.framework.datasource.BaseDataSource] Datasource [Error connecting] - Failed to connect to ZAPI at: datasource IP, check IP/port connectivity and assert ZAPI configuration. ([Device name 19X.XX.XX.XX]: Failed to connect to ZAPI at: datasource IP:80, check IP/port connectivity and assert ZAPI configuration.)
    • How to monitor volume latency and IOPS from Active IQ Unified Manager
      https://kb.netapp.com/data-mgmt/AIQUM/AIQUM_Kbs/How_to_monitor_volume_latency_and_IOPS_from_Active_IQ_Unified_Manager
      Applies to ActiveIQ Unified Manager 9 ONTAP 9 Monitoring performance is essential to ensuring proper storage experience Active IQ Unified Manager (AIQUM) is a free tool to monitor ONTAP 9 performance ...Applies to ActiveIQ Unified Manager 9 ONTAP 9 Monitoring performance is essential to ensuring proper storage experience Active IQ Unified Manager (AIQUM) is a free tool to monitor ONTAP 9 performance This article covers AIQUM 9.7 and shows examples of troubleshooting performance by helping monitor the IOPS and latency of individual volumes Note: The concepts apply to older versions of OnCommand Unified Manager (up to 9.4) or AIQUM 9.6, but Workload Analysis is unavailable in those versions.
    • Are performance metrics on System Manager DASHBOARD average?
      https://kb.netapp.com/on-prem/ontap/DM/System_Manager/SM-KBs/Are_performance_metrics_on_System_Manager_DASHBOARD_average
      Applies to ONTAP System Manager 9.8 or later Answer Yes, performance metrics are average values over time for the interval. Additional Information For System Manager Classic version, Dashboard window ...Applies to ONTAP System Manager 9.8 or later Answer Yes, performance metrics are average values over time for the interval. Additional Information For System Manager Classic version, Dashboard window for System Manager - ONTAP 9.7 and earlier states that performance metrics are average values. What API is used for display performance graph of System Manager's Dashboard?
    • High latency on SolidFire storage volume due to Max IOPs QoS set too low
      https://kb.netapp.com/Legacy/NetApp_HCI/OS/High_latency_on_SolidFire_storage_volume_due_to_Max_IOPs_QoS_set_too_low
      In SolidFire Active IQ (AIQ) under Volumes > Active Volumes > Actions > View Details > Latency you will observe higher than expected latency values: You will also notice during high latency that the t...In SolidFire Active IQ (AIQ) under Volumes > Active Volumes > Actions > View Details > Latency you will observe higher than expected latency values: You will also notice during high latency that the throughput is hitting its highest peak based on the Max QoS set. Below example shows QoS Max of 15,000 IOPS with a max throughput of 100 MB/sec, but when you look on the overall cluster performance is relatively very low:
    • High IOPS on vol0 due to ONTAP Tools for VMware
      https://kb.netapp.com/data-mgmt/OTV/VSC_Kbs/High_IOPS_on_vol0_due_to_ONTAP_Tools_for_VMware
      Applies to ONTAP 9 ONTAP Tools for VMware (OTV) Issue When monitoring IOPS for vol0 with statistics top file show command, similar entries are found: *Estimated Total IOPS Node Vserver Volume File ---...Applies to ONTAP 9 ONTAP Tools for VMware (OTV) Issue When monitoring IOPS for vol0 with statistics top file show command, similar entries are found: *Estimated Total IOPS Node Vserver Volume File ---------- ---------- ---------- ------ -------------- 3696 cdot1-06 cdot1-06 vol0 /etc/log/stats 3675 cdot1-07 cdot1-07 vol0 /etc/log/stats/rfa
    • Can I modify the IOPS and throughput for GP3 disks after the aggregate has been created in BlueXP?
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Can_I_modify_the_IOPS_and_throughput_for_GP3_disks_after_the_aggregate_has_been_created_in_BlueXP
      Yes, however the IOPS and throughput changes need to be made from the AWS EC2 console instead of BlueXP Alternatively, you can create a new GP3 aggregate in BlueXP with your preferred IOPS and through...Yes, however the IOPS and throughput changes need to be made from the AWS EC2 console instead of BlueXP Alternatively, you can create a new GP3 aggregate in BlueXP with your preferred IOPS and throughput, volume move any volumes to the new aggregate, and destroy the original aggregate in BlueXP When you select a gp3 disk, BlueXP fills in default IOPS and throughput values that provide performance that is equivalent to a gp2 disk based on the selected disk size.