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What are the conditions for volume auto-grow in ONTAP

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ontap-9
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Applies to

ONTAP 9

Answer

Volume auto-grow in ONTAP is triggered under the following conditions:
  • Monitoring Target:
    • The entire volume usage (data + Snapshot) is monitored.
    • If a Snapshot reserve is set, the reserved space is dedicated to Snapshots.
  • Trigger for Auto-Grow:
    • Auto-grow is triggered when the volume usage exceeds the auto-grow threshold (default is 95%). This "usage" includes both data and Snapshot space.
    • The threshold can be set using the `autosize-grow-threshold-percent` parameter.

cluster1::> volume autosize -vserver <vserver> -volume <volume> -grow-threshold-percent <percent>

  • Maximum Size Limit:

Each volume has a maximum size (`maximum-autosize`) setting. If the volume reaches this limit, it will not grow further.

cluster1::> volume autosize -vserver <vserver> -volume <volume> -maximum-size <size>

  • Sufficient aggregate space:

There must be enough free space in the aggregate that contains the volume to allow for the auto-grow.

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