A Thorough Introduction to 64-Bit Aggregates

An IBM Redpaper publication

Published 07 November 2011, updated 01 December 2011

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IBM Form #: REDP-4759-00
(30 pages)

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Authors: Alex Osuna, Uday Boppana, Tarik Jose Maluf


This IBM® Redpaper™ publication discusses the 64-bit aggregate type released in Data ONTAP 8.0 7-Mode. This publication is intended for IT and storage decision makers seeking a thorough introduction to the advantages of the 64-bit aggregate type released in Data ONTAP 8.0 7-Mode. The maximum size of a 64-bit aggregate is much bigger than the size that was supported in earlier releases of Data ONTAP. This aggregate type, called 64-bit aggregate, offers a much larger size threshold while providing all the advantages and capabilities of 32-bit aggregates, including flexibility and storage efficiency. FlexVol volumes that are created in 64-bit aggregates also have a bigger maximum size threshold.

This paper describes the following topics:

  • The need for 64-bit aggregates
  • Maximum aggregate and volume sizes
  • Maximum number of disks in a maximum-size aggregate
  • Configuration and operation
  • Differences between 64-bit and 32-bit aggregates
  • Interaction with other Data ONTAP 8.0 7-Mode features
  • Performance
  • Data Migration
  • Recommendations

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