What are the rules for Advanced Disk Partitioning?
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.