Understanding network utilization for c4.4xlarge and c4.8xlarge instances

You can launch ONTAP Cloud instances in AWS using the c4.4xlarge and c4.8xlarge instance types. These c4 instance types support a network maximum transmission unit (MTU) of 9,000 bytes by default, which can provide the highest maximum network throughput possible for specific configurations.

9,000 MTU (also called jumbo frames) is a good choice if clients in the same VPC communicate with the ONTAP Cloud system and some or all of those clients also support 9,000 MTU. If traffic leaves the VPC, packet fragmentation can occur, which degrades performance.

If needed, you can modify the network utilization from Cloud Manager by choosing standard network utilization, which has a network MTU of 1,500 bytes. This is a good choice if clients or systems outside of the VPC communicate with the ONTAP Cloud system.