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    • Can CHANGE NOTIFY option set  for CIFS  Vserver affect NFS  clients write performance?
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Can_CHANGE_NOTIFY_option_set_for_CIFS_Vserver_affect_NFS_clients
      Applies to Ontap 9 CIFS change notifications Answer Yes. In case the flexgroup/flexvolume has NTFS security style and uses a junction path that crosses a volume that holds a CIFS share with change not...Applies to Ontap 9 CIFS change notifications Answer Yes. In case the flexgroup/flexvolume has NTFS security style and uses a junction path that crosses a volume that holds a CIFS share with change notify enabled. Additional Information What is Change Notify?
    • High latency observed on volume with quotas enabled
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/High_latency_observed_on_volume_with_quotas_enabled
      High Write or Other latency on a volume with quota enabled. [node1: wafl_exempt13: quota.exceeded:debug]: params: {'ltype': 'hard', 'limit_value': '1024000', [node1: wafl_exempt02: wafl.quota.userQtre...High Write or Other latency on a volume with quota enabled. [node1: wafl_exempt13: quota.exceeded:debug]: params: {'ltype': 'hard', 'limit_value': '1024000', [node1: wafl_exempt02: wafl.quota.userQtree.exceeded.win:notice]: tid 2: disk quota exceeded on volume Additional warnings will be suppressed for approximately 60 minutes or until a 'quota resize' is performed.
    • CVO write performance impacted when using NetApp Volume Encryption (NVE)
      https://kb.netapp.com/Cloud/Cloud_Volumes_ONTAP/CVO_write_performance_impacted_when_using_NetApp_Volume_Encryption_NVE
      ::> qos statistics volume latency show Workload ID Latency Network Cluster Data Disk QoS NVRAM Cloud FlexCache SM Sync --------------- ------ ---------- ---------- ---------- ---------- ---------- ---...::> qos statistics volume latency show Workload ID Latency Network Cluster Data Disk QoS NVRAM Cloud FlexCache SM Sync --------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- -total- - 195.97ms 150.00us 0ms 796.00us 0ms 0ms 1195.03ms 0ms 0ms 0ms data1-wid30897 30897 1.60s 157.00us 0ms 818.00us 0ms 0ms 1.60s 0ms 0ms 0ms -total- - 536.23ms 110.00us 0ms 495.00us 0ms 0ms 535.63ms 0ms 0ms 0ms data1-wid30897 30897 0ms 0ms 0m…
    • Bursty write append workloads impacting write latency on AFF
      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
    • Write Performance Impacted by Back to Back Consistency Points
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Write_Performance_Impacted_by_Back_to_Back_Consistency_Points
      Applies to ONTAP 9 Non-AFF controllers more susceptible to this issue Issue A FlexVol or FlexGroup is experiencing increased / higher than expected write latency. Latency is reported as Data or Disk o...Applies to ONTAP 9 Non-AFF controllers more susceptible to this issue Issue A FlexVol or FlexGroup is experiencing increased / higher than expected write latency. Latency is reported as Data or Disk or WAFL Susp CP latency from qos statistics or AIQ Latency reported coincides exactly with WRITE workload increase. systat -x output shows evidence of CP type CP_Ty B (Back-to-Back) CPs
    • Slow CIFS write performance with flexcache writeback enabled volumes
      https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/Slow_CIFS_write_performance_with_flexcache_writeback_enabled_volumes
      Applies to ONTAP 9.15.1 Flexcache write-back CIFS Issue Writing small files 10MB and smaller to a Flexcache destination does not show any performance improvements over using Flexcache write-around con...Applies to ONTAP 9.15.1 Flexcache write-back CIFS Issue Writing small files 10MB and smaller to a Flexcache destination does not show any performance improvements over using Flexcache write-around configuration
    • High NVRAM latency in Cloud Volumes ONTAP - Resolution Guide
      https://kb.netapp.com/Cloud/Cloud_Volumes_ONTAP/High_NVRAM_latency_in_Cloud_Volumes_ONTAP_-_Resolution_Guide
      ::> qos statistics volume latency show Workload ID Latency Network Cluster Data Disk QoS NVRAM Cloud FlexCache SM Sync --------------- ------ ---------- ---------- ---------- ---------- ---------- ---...::> qos statistics volume latency show Workload ID Latency Network Cluster Data Disk QoS NVRAM Cloud FlexCache SM Sync --------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- -total- - 195.97ms 150.00us 0ms 796.00us 0ms 0ms 1195.03ms 0ms 0ms 0ms data1-wid30897 30897 1.60s 157.00us 0ms 818.00us 0ms 0ms 1.60s 0ms 0ms 0ms -total- - 536.23ms 110.00us 0ms 495.00us 0ms 0ms 535.63ms 0ms 0ms 0ms data1-wid30897 30897 0ms 0ms 0m…