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    • 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.