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    • Do space utilization considerations for ONTAP upgrade apply to root aggregates?
      https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/Do_space_utilization_considerations_for_ONTAP_upgrade_apply_to_root_aggregates
      Root Aggregate space utilization No, the space consideration apply to deduplicated volumes/aggregates only. The root volume and aggregate should not contain any user data and do not have deduplication...Root Aggregate space utilization No, the space consideration apply to deduplicated volumes/aggregates only. The root volume and aggregate should not contain any user data and do not have deduplication enabled. The root aggregate is created with 95% utilization by design, as it contains the root volume (vol0), that has space guarantees enabled (thick provisioned). Root aggregate with 95-99% utilization should not prevent a successful upgrade nor cause the deduplication to be disabled.
    • Root aggregate is missing after a Head Upgrade
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Root_aggregate_is_missing_after_a_Head_Upgrade
      Applies to ONTAP 9 Head Upgrade Issue Root aggregate is missing after head upgrade Console/SP: No root volume found. Rebooting... disks appear to be assigned, but no aggr found maintenance mode: *> ag...Applies to ONTAP 9 Head Upgrade Issue Root aggregate is missing after head upgrade Console/SP: No root volume found. Rebooting... disks appear to be assigned, but no aggr found maintenance mode: *> aggr show the system appears to have no disks! unable to run aggr command [localhost:raid.assim.tree.noRootVol:error]: No usable root volume was found!
    • ONTAP Select: root aggregate 99 percent usage
      https://kb.netapp.com/on-prem/ontap/ontap-select/Select-KBs/ONTAP_Select__root_aggregate_99_percent_usage
      Applies to NetApp ONTAP Select Root Aggregate Staging volume (MDV) CIFS Auditing Issue ONTAP Select root aggregate is reporting 99% space utilization.
    • Why is vol0 showing high number of IOPS?
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Why_is_vol0_showing_high_number_of_IOPS
      Internal ONTAP processes cause high IOPS on vol0 It is usually safe to ignore in most circumstances as this should have no performance impact to user workloads Engineering has stated that this is norm...Internal ONTAP processes cause high IOPS on vol0 It is usually safe to ignore in most circumstances as this should have no performance impact to user workloads Engineering has stated that this is normal, expected, and if observed no fix is needed in most circumstances 726693 High input output operations per second (iops/s) of type other_iops seen on volume vol0 830749 High input output operations per second (iops/s) of type other_iops seen on volume vol0
    • Why HA pairs have different number of drives for the root aggregate?
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Why_HA_pairs_have_different_number_of_drives_for_the_root_aggregate
      ONTAP decides the Root Data Data partition and disk configuration following the NetApp Hardware Universe ADP Root Partition Configuration section during node initialization. The root aggregate for the...ONTAP decides the Root Data Data partition and disk configuration following the NetApp Hardware Universe ADP Root Partition Configuration section during node initialization. The root aggregate for the first one will be 8 data disks + 2 parity disks + 2 spares in a RAID-DP configuration, so 12 disks twice in the HA pair. The root aggregate for the second one will be 6 data disks + 2 parity disks + 1 spare in a RAID-DP configuration, so 9 disks twice in the HA pair.