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NetApp Knowledge Base

How to identify spare disks for root-data partitioning in ONTAP

Last Updated:

Applies to

  • ONTAP 9


With Advance Disk Partitioning (ADP), a physical disk is divided into a small number of partitions at the storage level, and each partition is treated by RAID and HA as a logical disk. Aggregates are provisioned from partitions, instead of from whole disks. The ability to share a disk across nodes and aggregates helps greatly improve the storage efficiency on entry configurations, such as on 12 HDD and 24 HDD NetApp FAS systems, and on All-Flash FAS (AFF) systems. 

Currently there are two types of disk partitioning:

  • Root-Data partitioning
  • Storage Pool partitioning 

This article describes the procedure to identify spare disks for root-data partitioning. Entry-level systems and AFF systems use 'root-data' partitioning. In this method of partitioning, the disk is partitioned into two unequal-sized partitions. The larger of the two disk partitions, the P1 partition, is used for customer data aggregates. The smaller of the two disk partitions, the P2 partition, is used for the root aggregate.


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