Functions are available in IO1 storage to create both instance system volumes and additional volumes. The option of creating snapshots using the OpenStack platform is also available. Please note that IO1 storage is only available in the AVZ1 Availability Zone.
The IO1 storage is designed for clients whose projects contain highly loaded services and need high performance disk subsystem.
An additional benefit of IO1 is more I/O for software that works with data on disk in single-threaded mode. The best option for increased performance would be a combination of using IO1 storage along with high-frequency Power vCPU cores.