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    • Very low WRITE throughput on CVO instance
      https://kb.netapp.com/Cloud/Cloud_Volumes_ONTAP/Very_low_WRITE_throughput_on_CVO_instance
      Applies to Azure: Cloud Volumes ONTAP ONTAP: 9.7P5 CVO instance Standard_DS5_v2 with premium SSDs and fast write mode enabled Issue Extremely low throughput and high latency on a volume running on sin...Applies to Azure: Cloud Volumes ONTAP ONTAP: 9.7P5 CVO instance Standard_DS5_v2 with premium SSDs and fast write mode enabled Issue Extremely low throughput and high latency on a volume running on single CVO instance with Fast Write Mode and premium SSD aggregate. Write throughput of 30MB/s was much less than expected throughput.
    • Latency higher than expected for AFF system
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Latency_higher_than_expected_for_AFF_system
      Applies to ONTAP AFF Issue More than ~1ms latency for AFF system. In OCUM, high latency is reported. Higher latency/Lower throughput in conjunction with larger operation sizes.
    • FCP/FCoE LIF reports operationally down due to Faulty switch SFP
      https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/FCP_FCoE_LIF_reports_operationally_down_due_to_Faulty_switch_SFP
      Initiators are unable to connect to the FCP LIF or access LUNs presented by that LIF. Network interface show output reports the status of FCP LIF as administratively up and operationally down. Network...Initiators are unable to connect to the FCP LIF or access LUNs presented by that LIF. Network interface show output reports the status of FCP LIF as administratively up and operationally down. Network fcp adapter show output reports the adapter status as "Link disconnected". Cluster1::> network fcp adapter show –fields status show interface transceiver output on connected cisco switch reports low Tx power for the affected storage connected port.
    • Poor network performance from ifgrp sequential distribution
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Poor_network_performance_from_ifgrp_sequential_distribution
      % tshark -r tcpdump_s300.pcap -Y 'tcp.analysis.out_of_order' 7 0.000051 0.000000000 10.0.6.8 10.0.6.6 TCP 2049,978 [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351561750 Ack=971185171 Win=30841 Len=8948 T...% tshark -r tcpdump_s300.pcap -Y 'tcp.analysis.out_of_order' 7 0.000051 0.000000000 10.0.6.8 10.0.6.6 TCP 2049,978 [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351561750 Ack=971185171 Win=30841 Len=8948 TSval=2423401583 TSecr=2663433141 9 0.000059 0.000008000 10.0.6.8 10.0.6.6 TCP 2049,978 [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351588910 Ack=971185171 Win=30841 Len=8948 TSval=2423401583 TSecr=2663433141 11 0.000067 0.000008000 10.0.6.8 10.0.6.6 TCP 2049,978 [TCP Out-Of-Order] 2049 → 978 [ACK] Seq…
    • Performance Impact due to FCP Queue Depth Threshold Reached
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Performance_Impact_due_to_FCP_Queue_Depth_Threshold_Reached
      A production outage may occur in the form of extremely high latency similar to performance issue NMP: nmp_ThrottleLogForDevice:2349: Cmd 0x1a(0x413680446300, 0) to dev "mpx.vmhba32:C0:T0:L0" on path "...A production outage may occur in the form of extremely high latency similar to performance issue NMP: nmp_ThrottleLogForDevice:2349: Cmd 0x1a(0x413680446300, 0) to dev "mpx.vmhba32:C0:T0:L0" on path "vmhba32:C0:T0:L0" Failed: H:0x0D:0x28 P:0x0 Valid sense data: 0x0 0x0 0x0. NMP: nmp_ThrottleLogForDevice:2349: Cmd 0x88(0x412e80451080, 36817) to dev "naa.600a123" on path"vmhba1:C0:T1:L34" Failed: H:0x0 D:0x8 P:0x0 Possible sense data: 0x0 0x0 0x0.
    • Low throughput while restoring a file
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Low_throughput_while_restoring_a_file
      Applies to Ontap 9.3+ VMWARE version 6.7 Commvault version 11 service pack 18 Issue Low throughput while performing VM restore to a NETAPP volume using commvault. Out of place restore from commvault e...Applies to Ontap 9.3+ VMWARE version 6.7 Commvault version 11 service pack 18 Issue Low throughput while performing VM restore to a NETAPP volume using commvault. Out of place restore from commvault exhibits poor throughput to VMFS datastore on FC LUN. Storage performance/latency was optimal from storage.
    • High CPU utilization when IOPS are lower than expected
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/High_CPU_utilization_when_IOPS_are_lower_than_expected
      CPU NFS CIFS Total Net kB/s SSD kB/s Cache CP CP_Ty CP_Ph HDD SSD FCP iSCSI FCP kB/s iSCSI kB/s in out read write hit time [T--H--F--N--B--O--#--:] [n--v--p--f] util util in out in out 87% 0 0 18865 2...CPU NFS CIFS Total Net kB/s SSD kB/s Cache CP CP_Ty CP_Ph HDD SSD FCP iSCSI FCP kB/s iSCSI kB/s in out read write hit time [T--H--F--N--B--O--#--:] [n--v--p--f] util util in out in out 87% 0 0 18865 27005 1437837 766806 36 59% 0% 0--0--0--0--0--0--0--0 0--0--0--0 0% 10% 0 18865 0 0 14153 1401718 91% 0 0 20361 54662 1411932 704124 12 59% 0% 0--0--0--0--0--0--0--0 0--0--0--0 0% 11% 0 20349 0 0 84279 1323838 86% 0 0 19373 67099 1362633 636356 36 56% 0% 0--0--0--0--0--0--0--0 0--0--0--0 0% 10% 0 19…
    • High latency on volumes with indirect access due to RCF file
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/High_latency_on_volumes_with_indirect_access_due_to_RCF_file
      Applies to ONTAP 9.7 Cisco Nexus 3232C BES-53248 Cluster switch Issue High Read/Write latency in OCUM with indirect access of volumes