How ONTAP Cloud uses cloud storage

Cloud Manager makes storage provisioning easy by purchasing the AWS and Azure storage that you need to provision volumes for ONTAP Cloud. Knowing how ONTAP Cloud uses cloud storage can help you understand your storage costs.

Disks and aggregates

ONTAP Cloud uses AWS and Azure volumes as back-end storage. It sees these volumes as disks and groups them into one or more aggregates. Aggregates provide storage to one or more ONTAP Cloud volumes:

This illustration shows an aggregate that is comprised of EBS disks, and the data volumes that ONTAP Cloud makes available to hosts.

In AWS, an aggregate can contain up to 6 disks. The underlying disk type can be a single EBS storage type or a tiered storage configuration that includes an EBS performance tier and an S3 capacity tier. The maximum disk size is 16 TB, which enables an aggregate up to 85.05 TB of usable capacity.

In Azure, an aggregate can contain up to 12 disks. The underlying Azure managed disk type can be either Standard Storage (HDD) or Premium Storage (SSD). The maximum disk size is 4 TB, which enables an aggregate up to 42.52 TB of usable capacity.

Note: Refer to the ONTAP Cloud Release Notes for a full list of storage limits.

You choose the disk type and the default disk size when you deploy an ONTAP Cloud system.

Choosing an AWS disk type

Choosing an Azure disk type

Choosing disk size

Note: The total amount of storage purchased from AWS or Azure is the raw capacity. The usable capacity is less because approximately 12 to 14 percent is overhead that is reserved for ONTAP Cloud use. For example, if Cloud Manager creates a 500 GB aggregate, the usable capacity is 442.94 GB.

ONTAP Cloud boot and root data for AWS

In addition to the storage for user data, Cloud Manager also purchases the following AWS storage for each ONTAP Cloud system:

Note: In an HA pair, both ONTAP Cloud nodes replicate its root disk to the partner node.

ONTAP Cloud boot and root data for Azure

In addition to the storage for user data, Cloud Manager also purchases the following Azure storage for each ONTAP Cloud system:

Where the disks reside

Cloud Manager lays out the storage from AWS and Azure as follows: