Instance store volume limits for EC2 instances

The number, size, and type of instance store volumes are determined by the instance type. Some instance types, such as C8i, M8i, and R8i, do not support instance store volumes, while other instance types, such as C8id, M8id, and R8id, do support instance store volumes. You can’t attach more instance store volumes to an instance than is supported by its instance type. For the instance types that do support instance store volumes, the number and size of the instance store volumes vary by instance size. For example, r8id.large supports 1 x 118 GB instance store volume, while r8id.32xlarge supports 2 x 3800 GB instance store volumes.

For instance types with NVMe instance store volumes, all of the supported instance store volumes are automatically attached to the instance at launch. For instance types with non-NVMe instance store volumes, such as C1, C3, M1, M2, M3, R3, D2, H1, I2, X1, and X1e, you must manually specify the block device mappings for the instance store volumes that you want to attach at launch. Then, after the instance has launched, you must format and mount the attached instance store volumes before you can use them. You can't attach an instance store volume after you launch the instance.

Some instance types use NVMe or SATA-based solid state drives (SSD), while others use SATA-based hard disk drives (HDD). SSDs deliver high random I/O performance with very low latency, but you don't need the data to persist when the instance terminates or you can take advantage of fault-tolerant architectures. For more information, see SSD instance store volumes for EC2 instances.

The data on NVMe instance store volumes and some HDD instance store volumes is encrypted at rest. For more information, see Data protection in Amazon EC2.

Available instance store volumes