Explanation: Generally, AWS EC2 allows running 20 on-demand instances and 100 spot instances at a time. This limit can be increased by requesting at https://aws.amazon.com/contact-us/ec2-request. Excluding certain types of instances, the limit is lower than mentioned above. For cg1.4xlarge, the user can run only 2 on-demand instances at a time.
Reference:
http://docs.aws.amazon.com/general/latest/gr/aws_service_limits.htm…