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What are the rules for Advanced Disk Partitioning?

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Applies to

  • Clustered Data ONTAP 8.3
  • ONTAP 9

Answer

The following rules are enforced automatically when Advanced Disk Partitioning for versions 1 & 2 as specified.

  • ADPv1 is only supported for HDD and ADPv2 is only supported for SSD disks.
  • Root partitions, P2 for ADPv1 or P3 for ADPv2; can only be used for the root aggregates. 
  • A RAID group cannot have more than one partition from the same disk (ADPv2).

Example:  for partitioned disk 0a.00.1, partitions 0a.00.1P1 and 0a.00.P2 can not be in the same RAID group.  They can be in different RAID groups of the same aggregate.

  • Partitioned and non-partitioned disks can be present together in the same aggregate, however, they must be in different RAID groups.
  • The only supported RAID type for aggregates containing root-data partitioned disks (ADPv1) is RAID-DP.  RAID4 is not supported.
  • The only supported RAID types for aggregates containing root-data-data partitioned disk (ADPv2) are RAID-TEC and RAID-DP.  RAID4 is not supported.
  • All Flash systems only support ADPv2.
  • For ADPv1, there must be (1) whole HDD available on each node of the HA pair.  The disk can be partitioned, but both partitions must be available as spares.
  • In default for ADPv1, owner of partitions are same as container; for ADPv2, owner of secondary data partition should be different with the root partition and primary data partition.
  • For AFF systems using ADPv2 require spares as shown

If all RAID groups are partitioned disks, with the same disk container type; (1) whole spare per HA is required.  The spare can be partitioned across the nodes.

If there is a mix of partitioned disk and non-partitioned disk RAID groups, then the requirement is (1) whole spare per node so that a spare is always available both for the partitioned RAID groups and the whole disk RAID groups.

  • ADPv1 initializes an HA pair with 24 HDD partitions; however, more partitions can be created after initialization
  • ADPv2 initializes an HA pair with 48 SSD partitions; however, more partitions can be created after initialization
  • For ADPv2, the minimum recommended same size or type to satisfy the hot spares/node requirements within ONTAP with Mixed Whole and Partitioned RAID Groups

Disk Count Number of spares required per node
1 - 100 1
101 - 400 2
401 - 600 3
601+ 4

Additional Information

  • The following example error message is reported when attempting to change the RAID type to an unsupported version:

cluster1::> aggr modify -aggregate aggr0 -raidtype raid4

Error: command failed: Failed to modify raidtype of aggregate "aggr0".
Reason: Change to raidtype RAID4 is not supported. Fields that were successfully modified: none

  • NetApp Hardware Universe contains extensive information for each supported platform on initial partition sizes for each supported disk type.
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