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How space is allocated inside a new Infinite Volume

Several rules govern how space is allocated to constituents when an Infinite Volume is created. Understanding these rules can help you understand the best practices for configuring aggregates for an Infinite Volume.

The following rules govern how space is allocated to constituents when an Infinite Volume is created:

  1. The namespace constituent and its mirror copies are created.

    Before any space is allocated for data, the namespace constituent and namespace mirror constituents are created as big as possible within their maximum sizes.

    1. The namespace constituent is placed on the aggregate with the most available space on any node that the Infinite Volume uses.
    2. The first namespace mirror constituent is placed on the aggregate with the next most available space, as long as the aggregate is on a node that meets all of the following conditions:
      • The node is used by the Infinite Volume.
      • It does not already contain the namespace constituent.
      • It is preferably not the partner node in the HA pair of the node that contains the namespace constituent.
    3. If SnapDiff is enabled, additional namespace mirror constituents are placed on the aggregate with the most available space on each remaining node used by the Infinite Volume.
  2. The data capacity is divided equally among the nodes that the Infinite Volume uses.

    The data capacity of an Infinite Volume is balanced across nodes. Data capacity is the space remaining from the Infinite Volume's size after deducting the space required by the namespace-related constituents.

  3. Within each node, individual data constituents are made as big as possible within a specified maximum.

    Data constituents are always created as big as they are allowed to be within a specified maximum. Each time that Data ONTAP creates a data constituent, it evaluates all of the aggregates that the Infinite Volume uses on the node and selects the aggregate that has the most available space.