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    • Higher read I/O latency with some bursty workloads
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Higher_read_I_O_latency_with_some_bursty_workloads
      High LUN or volume read latency with some bursty workloads seen as coming from disks.
    • Why is the reported LUN latency higher than the volume latency in Data ONTAP 7-Mode?
      https://kb.netapp.com/Legacy/ONTAP/7Mode/Why_is_the_reported_LUN_latency_higher_than_the_volume_latency_in_Data_ONTAP_7_Mode
      LUN latency(iSCSI latency or FCP latency) is measured from when the first PDU of the command is fully received, until the time the last PDU of the response is sent to the output queue of ONTAP. The ti...LUN latency(iSCSI latency or FCP latency) is measured from when the first PDU of the command is fully received, until the time the last PDU of the response is sent to the output queue of ONTAP. The time spent between each 64KB PDU handling is the Network Round Trip time, which also includes the client handling time, the time that it takes for the client to send out the next 64KB PDU, such as the time between 2 and 4, between 4 and 6, and between 6 and 8
    • How to tune iSCSI Qdepth on Microsoft iSCSI SW initiator
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/How_to_tune_iSCSI_Qdepth_on_Microsoft_iSCSI_SW_initiator
      Applies to Ontap iSCSI SW initiator Issue High latency on iSCSI LUN's during short period.
    • Very high lun latency reported in OCUM 9.5 or earlier after upgrading to ONTAP 9.7
      https://kb.netapp.com/Legacy/OnCommand_Suite/Very_high_lun_latency_reported_in_OCUM_9.5_or_earlier_after_upgrading_to_ONTAP__9.7
      Applies to ActiveIQ Unified Manager (AIQUM) 9.6 OnCommand Unified Manager(OCUM) 7.2 OnCommand Unified Manager(OCUM) 7.3 OnCommand Unified Manager(OCUM) 9.4 OnCommand Unified Manager(OCUM) 9.5 Issue Da...Applies to ActiveIQ Unified Manager (AIQUM) 9.6 OnCommand Unified Manager(OCUM) 7.2 OnCommand Unified Manager(OCUM) 7.3 OnCommand Unified Manager(OCUM) 9.4 OnCommand Unified Manager(OCUM) 9.5 Issue Data ONTAP was upgraded from 9.3 to 9.7 and OCUM reported lun latency as high as 25000ms with hardly any workload. Checking the same lun/volume in QOS real time showed latency less than 2ms.