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Storage : Aggregates : Understanding aggregates : Introduction to 64-bit and 32-bit aggregate formats
Introduction to 64-bit and 32-bit aggregate formats
Aggregates are either 64-bit or 32-bit format. 64-bit aggregates have much larger size limits than 32-bit aggregates. 64-bit and 32-bit aggregates can coexist on the same storage system.
32-bit aggregates have a maximum size of 16 TB; 64-bit aggregates' maximum size depends on the storage system model. For the maximum 64-bit aggregate size of your storage system model, see the Hardware Universe (formerly the System Configuration Guide) at support.netapp.com/knowledge/docs/hardware/NetApp/syscfg/index.shtml.
By default, newly created aggregates are 32-bit for storage systems running Data ONTAP versions earlier than 8.1, and 64-bit for storage systems running Data ONTAP 8.1 or later.
You can expand 32-bit aggregates to 64-bit aggregates by increasing their size beyond 16 TB. 64-bit aggregates, including aggregates that were previously expanded, cannot be converted to 32-bit aggregates.

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