Why HA pairs have different number of drives for the root aggregate?
Applies to
- Root-Data-Data partitioning.
- Two High Availability (HA) pairs with different number of internal disks installed.
Answer
ONTAP decides the Root Data Data partition and disk configuration following the NetApp Hardware Universe ADP Root Partition Configuration
section during node initialization.
Additional Information
- Example for one HA pair with 24 disks installed and another with 18:
- The root aggregate for the first one will be 8 data disks + 2 parity disks + 2 spares in a RAID-DP configuration, so 12 disks twice in the HA pair.
- The root aggregate for the second one will be 6 data disks + 2 parity disks + 1 spare in a RAID-DP configuration, so 9 disks twice in the HA pair.
- How to use a partial set of installed disks for Advanced Disk Partitioning (ADP)
- Considerations for sizing RAID groups