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How ONTAP Evaluates Capacity When Provisioning Multiple LUNs in ASA R2

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Applies to

  • NetApp ONTAP systems
  • ASA R2
  • Environments provisioning multiple LUNs where capacity is distributed across aggregates

Answer

  • ONTAP provisions LUNs based on aggregate‑level capacity or, in ASA R2 environments, based on available capacity within Storage Availability Zones (SAZ).
  • Total cluster free space alone does not determine whether multiple LUNs can be provisioned simultaneously.
  • When provisioning multiple LUNs, each individual LUN must fit within the available capacity of an aggregate, or be placed automatically across aggregates through SAZ where supported.
  • Even when overall cluster capacity is sufficient, LUN placement remains governed by aggregate or SAZ allocation rules.
  • When LUN provisioning is performed in alignment with this behavior—allowing LUNs to be distributed across available aggregates or handled automatically through SAZ—LUN creation proceeds successfully.

Additional Information

  • In traditional ONTAP environments, a LUN can only be created if a single aggregate has sufficient free space for that LUN.
  • In ASA R2 environments, customers typically provision storage through SAZ, where ONTAP abstracts aggregate management and automatically places LUNs based on available pooled capacity.
  • There is no documented hard limit indicating that only 50% of an aggregate can be used for user data in ONTAP 9.16.1 for ASA R2.
  • This behavior is expected and does not indicate a software defect or configuration issue.
  • No configuration change or software fix was required to resolve the scenario.
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