Skip to main content
NetApp Knowledge Base

Search

  • Filter results by:
    • View attachments
    Searching in
    About 8 results
    • Low latency and High CPU or DISK utilization due to deduplication
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Low_latency_and_High_CPU_or_DISK_utilization_due_to_deduplication
      Applies to ONTAP 9 Active IQ Unified Manager Issue High CPU or DISK utilization is seen, possibly despite low IOPs This occurs when a deduplication job is running a scheduled volume efficiency scan No...Applies to ONTAP 9 Active IQ Unified Manager Issue High CPU or DISK utilization is seen, possibly despite low IOPs This occurs when a deduplication job is running a scheduled volume efficiency scan Node Performance Limit - System Node Utilization messages being received via Active IQ Unified Manager (AIQUM) Consistently seeing very high resource consumption on single node
    • How do I know if CPU is causing a performance issue?
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/How_do_I_know_if_CPU_is_causing_a_performance_issue
      Is High CPU utilization causing a performance issue? Looking at the Cluster Components, the two main CPU resources are: If these two components make up the majority of your latency, then CPU is the pr...Is High CPU utilization causing a performance issue? Looking at the Cluster Components, the two main CPU resources are: If these two components make up the majority of your latency, then CPU is the primary factor in overall latency. In most AFF systems, CPU is the primary contributor to latency. It would be a 'problem' only if the latency seen is higher than expected. As with UM, if these two components comprise the majority of latency, then CPU is the primary factor in overall latency
    • High HostOS CPU utilization due to problems with secd
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/High_HostOS_CPU_utilization_due_to_problems_with_secd
      Applies to Clustered Data ONTAP 8.3 ONTAP 9 Issue Sudden or gradual increase in CPU utilization Unexplained and prolonged spikes in CPU utilization Running sysstat -M shows utilization in HostOS domai...Applies to Clustered Data ONTAP 8.3 ONTAP 9 Issue Sudden or gradual increase in CPU utilization Unexplained and prolonged spikes in CPU utilization Running sysstat -M shows utilization in HostOS domain compared to other domains On each of the affected nodes, running set diag -c off; systemshell -node nodename ps aux, confirms secd is the top consumer of HostOS resources. Higher than expected NAS Protocol latency Authentication request timeouts may be present
    • Sudden latency and CPU utilization from workloads
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Sudden_latency_and_CPU_utilization_from_workloads
      CPU is constantly high and performance capacity alert triggered on node.
    • Sudden latency and CPU utilization from workloads going idle to busy resolved by QoS
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Sudden_latency_and_CPU_utilization_from_workloads_going_idle_to_busy_resolved_by_QoS
      CPU is high constantly and sudden latency is observed. KB article provides the cause for CPU resources to exhaust and the solution for this issue.
    • High Disk or CPU utilization due to excessive Container Block Reclamation scanners
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/High_Disk_or_CPU_utilization_due_to_excessive_Container_Block_Reclamation_scanners
      Applies to All versions of ONTAP or Data ONTAP Issue Container Block Reclamation (CBR) scanners is a process of releasing unused blocks from volume space, i.e after snapshot deletions. In some instanc...Applies to All versions of ONTAP or Data ONTAP Issue Container Block Reclamation (CBR) scanners is a process of releasing unused blocks from volume space, i.e after snapshot deletions. In some instances, excessive CBR scanners can impact other work-loads.
    • High HOST CPU domain utilization from nphmd
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/High_HOST_CPU_domain_utilization_from_nphmd
      Applies to ONTAP 9+ Clustered ONTAP 8 Issue High CPU utilization on the node by Host Domain. Run sysstat -M 1 on the node reporting high CPU. The PS output , PS-AXRHWWW output from ASUP , Top command ...Applies to ONTAP 9+ Clustered ONTAP 8 Issue High CPU utilization on the node by Host Domain. Run sysstat -M 1 on the node reporting high CPU. The PS output , PS-AXRHWWW output from ASUP , Top command from systemshell show HostDomain driven by NPHMD process.
    • Why does the CVO show 100 percent cpu utilization
      https://kb.netapp.com/Cloud/Cloud_Volumes_ONTAP/Why_does_the_CVO_show_100_percent_cpu_utilization
      Unable to get the CPU / Memory utilization report of the VM hosting the CVO node under metrics In virtual environments, ONTAP keeps the vCPUs in an always-ready state to improve the performance of the...Unable to get the CPU / Memory utilization report of the VM hosting the CVO node under metrics In virtual environments, ONTAP keeps the vCPUs in an always-ready state to improve the performance of the system. ONTAP does not perform the halt CPU instruction when idle and this makes the idle thread appear to be hot on a vCPU. In comparison, you can see the actual CPU utilization from the ONTAP perspective via the sysstat (or statistics show) command from the ONTAP CLI.