What are the rules for Advanced Disk Partitioning?
Applies to
- ONTAP 9
- ADPv1 or ADPv2
- Root-data partitioning
Answer
| Topic | ADPv1 (root-data) | ADPv2 (root-data-data) |
| Number of partitions per drive |
1 data partition labeled P1 1 root partition labeled P2 |
2 equal-sized data partitions labeled P1 and P2 1 root partition labeled P3 |
| ONTAP model support |
FAS Refer to the NetApp Hardware Universe for additional information. |
AFF and all-SSD FAS systems initialized with ONTAP 9.0 or later will utilize ADPv2 partitioning Refer to the NetApp Hardware Universe for additional information. |
| HDD | Supported | Unsupported |
| SSD | Supported | Supported |
| Maximum drives partitioned at system initialization | 24 | 48 |
| Supported RAID type |
RAID-TEC RAID-DP |
RAID-TEC RAID-DP RAID4 (ONTAP 9.5 and later) |
| Partition sizes created at system initialization | Refer to NetApp Hardware Universe, select the FAS platform and ONTAP version, and from the result choose the ADP Root Partition Configuration link | Refer to NetApp Hardware Universe, select the AFF platform and ONTAP version, and from the result choose the ADP Root Partition Configuration link |
| Mixing of partitions and whole disks in same RAID group | Unsupported | Unsupported |
| Mixing of partitions and whole disks in same aggregate with separate RAID groups for each | Supported | Supported |
|
Maximum drives allowed to be partitioned in an HA pair Note: Refer to NetApp Hardware Universe for platform-specific drive limits |
480 in ONTAP 9.14.1 and later 240 in previous ONTAP releases |
480 in ONTAP 9.14.1 and later 240 in previous ONTAP releases |
| Root partition usage | Only available to be used for the node root aggregate | Only available to be used for the node root aggregate |
| Using both partitions from single disk in the same aggregate | Not applicable | Supported, but each partition must be in a unique RAID group |
| Partition and container (disk) ownership | The same node owns the container and the partitions |
One node owns the container, root partition, and the first data partition The HA partner node owns the second data partition |
| Automatic partitioning support in ONTAP | Refer to Why is a newly added disk not auto-partitioned on ADP systems? | Refer to Why is a newly added disk not auto-partitioned on ADP systems? |
| Spare requirements if all aggregates contain RAID groups that use partitions | 1 whole HDD available on each node of the HA pair (the disk can be partitioned, but both partitions must be available as spares) | 1 whole spare disk per HA pair is required (the spare can be partitioned across the nodes) |
| Spare requirements if aggregates contain RAID groups with a mix of partitions and whole disks | 2 whole spare disks for each node that has both a partitioned disk RAID group and a non-partitioned RAID group | 1 whole spare disk per node so that a spare is always available both for the partitioned disk RAID groups and the whole disk RAID groups |
| Spare requirements overall | Refer to Spares Low Resolution guide | Refer to Spares Low Resolution guide |
NOTE!
ADP v2 is unsupported in mixed SSD/HDD configuration no matter in AFF or FAS platform.
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.