VVCR’s clusters run on AWS On-Demand Instances. You pay for the seconds instances are running. There is a 60-second minimum before being charged.
AWS limits the number of running On-Demand Instances per account and region. The limit is determined by the number of Virtual Central Processing Units (vCPUs) that the running instance is using.
For example, a t3.medium instance uses 2 vCPU credits and a g4dn.4xlarge instance requires 16 vCPU credits.
Each of the 8 instance type families have their own limit:
- On-Demand Standard (A, C, D, H, I, M, R, T, Z) instances
- On-Demand DL instances
- On-Demand F instances
- On-Demand G and VT instances
- On-Demand High Memory instances
- On-Demand Inf instances
- On-Demand P instances
- On-Demand X instances
You can launch any combination of instance types as long as the number of vCPUs does not exceed your account limit. AWS provides a vCPU limits calculator to determine the number of vCPUs you may need. You can request a limit increase at any time and EC2 automatically raises your limit based on your usage.
You can find your current limits in the Limits page in the Amazon EC2 console.
Click here for more information on EC2 vCPU Limits.
Click here to learn how to request an EC2 vCPU Limit Increase.