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    • What are Calculate Parity reads (CP reads) and why it makes extra disk reads?
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/What_are_Calculate_Parity_reads_CP_reads_and_why_it_makes_extra_disk_reads
      Disk cpreads are blocks that are read by RAID to satisfy a write known as Calculate Parity Reads Consistency Point are a normal state of Data ONTAP processing under which dirty buffers are de-staged t...Disk cpreads are blocks that are read by RAID to satisfy a write known as Calculate Parity Reads Consistency Point are a normal state of Data ONTAP processing under which dirty buffers are de-staged to disk From statit, cpreads column refers to CP reads (Calculate Parity Reads) these are extra reads apart from user reads which can also contribute to Disk reads
    • Disk utilization of the snapmirror source system reaches 100 percent
      https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/Disk_utilization_of_the_snapmirror_source_system_reaches_100_percent
      Applies to ONTAP 9 SnapMirror Issue Original disk utilization of the snapmirror source system has already reached 70~90%. If additional snapmirror workload is added to this source system, the disk uti...Applies to ONTAP 9 SnapMirror Issue Original disk utilization of the snapmirror source system has already reached 70~90%. If additional snapmirror workload is added to this source system, the disk utilization reaches 100%, causing service delays from this source system.
    • 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
    • OCUM Alert: Max Data Disk Utilization value
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/OCUM_Alert__Max_Data_Disk_Utilization_value
      Applies to OCUM OCUM triggering alerts for disk utilization on aggregate as below: Risk - Aggregate Disks Over-utilized Warning Threshold Breached Impact Area - Performance Severity - Warning State - ...Applies to OCUM OCUM triggering alerts for disk utilization on aggregate as below: Risk - Aggregate Disks Over-utilized Warning Threshold Breached Impact Area - Performance Severity - Warning State - New Source - Clusterxxx-01:Clusterxxx_01_aggr1 Cluster Name - Clusterxxx Cluster FQDN - clusterNA2.aaa.yyyyy.zzz.au Trigger Condition - MAX Data Disk Utilization value of 97% on Clusterxxx_01_aggr1 has triggered a WARNING event based on threshold setting of 95%. Description - Aggregate Warnings
    • High disk utilization at night between 1 to 5 AM
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/High_disk_utilization_at_night_between_1_to_5_AM
      All FAS, AFF, Cloud Volumes ONTAP, or ONTAP Select clusters or Metroclusters Disk utilization is seen or reported to be high daily at 1 AM (cluster time) to 5 AM or on Sundays 1AM to 7 AM (AFF) or 1 A...All FAS, AFF, Cloud Volumes ONTAP, or ONTAP Select clusters or Metroclusters Disk utilization is seen or reported to be high daily at 1 AM (cluster time) to 5 AM or on Sundays 1AM to 7 AM (AFF) or 1 AM to 1 PM (FAS) A high disk utilization alert is seen for high disk load overnight, and is not when deduplication or other processes are running MAX Data Disk Utilization value of % on <aggregate> has triggered a WARNING event based on threshold setting of 95%
    • Aggregate has high disk utilization due to large deletion
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Aggregate_has_high_disk_utilization_due_to_large_deletion
      Applies to FAS systems ONTAP 9 Issue Disk utilization suddenly goes to 100%, but no clear workload can be seen
    • Latency for virtual environment
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Latency_for_virtual_environment
      Applies to FAS2620 ONTAP 9.4P5 Issue High latency in virtual environment after new raidgroup is created
    • 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.
    • Constant High Disk Utilization in the Root Volume
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Constant_High_Disk_Utilization_in_the_Root_Volume
      Applies to Data Ontap 8 ONTAP 9 ONTAP 7 mode Symptom Constant high disk utilization at or near 100% on the root volume.
    • What happens when an SSD aggregate reaches high percentage of the total capacity?
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/What_happens_when_an_SSD_aggregate_reaches_high_percentage_of_the_total_capacity
      Applies to AFF systems Comparing to HDD aggregated where we might see performance issue in highly utilized environment with SSD aggregates this shouldn't be a case. This is due to differences in techn...Applies to AFF systems Comparing to HDD aggregated where we might see performance issue in highly utilized environment with SSD aggregates this shouldn't be a case. This is due to differences in technology used to access the data. HDD disks have mechanical parts and different design which has big contribution in system performance SSD disks use a different technology and don't have mechanical parts. Therefore the access to the data is faster and shouldn't be affect by how full is the aggregate
    • Cloud Volumes ONTAP - Disk utilization and latency - Resolution Guide
      https://kb.netapp.com/Cloud/Cloud_Volumes_ONTAP/Cloud_Volumes_ONTAP_-_Disk_utilization_and_latency_-_Resolution_Guide
      Cloud Volumes ONTAP helps troubleshoot high disk utilization or latency in ONTAP.  Latency is shown in the Disk or Aggregate Processing (Active IQ Unified Manager), and latency actively impacts the ta...Cloud Volumes ONTAP helps troubleshoot high disk utilization or latency in ONTAP.  Latency is shown in the Disk or Aggregate Processing (Active IQ Unified Manager), and latency actively impacts the target volume.