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What is volume autosize in Data ONTAP?

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Applies to

ONTAP 9

Answer

What does volume autosize do?
  • Volume autosize is a policy-based space-management feature in ONTAP that allows the volume to grow by an increment if the volume is nearly full
  • The nearly full threshold is defined by the flag wafl_reclaim_threshold
  • When a write is sent to the node that is larger than available space, ONTAP will try to write as much as possible before failing the write with a volume full message
    • During the next check, the volume will grow by increments until it has reached the minimum free space threshold
    • This means that autosize is best described as 'grow on use,' rather than 'grow on demand,' a distinction that should be remembered when planning thresholds and grow increments
  • Note that volume autosize does not infinitely grow the volume.
    • The volume will grow until it reaches the maximum autosize value and then no more space will be allocated
  • The grow and grow_shrink modes work together with Snapshot autodelete to automatically reclaim space when a volume is about to become full; the volume parameter -space-mgmt-try-first controls the order in which these two space reclamation policies are attempted
Autosize Command Syntax

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