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Hello.
"Only one open service quota increase request is allowed per quota."
It's probably because the service quota request hasn't been completed yet.
Please wait a little longer and try sending your request.
https://repost.aws/knowledge-center/troubleshoot-service-quotas-cli-commands
Only one open service quota increase request is allowed per quota. If you submit another request before the previous one completes, then you receive the ResourceAlreadyExistsException error.
You can change the EBS volume size by following the steps in the document below.
https://docs.aws.amazon.com/ebs/latest/userguide/requesting-ebs-volume-modifications.html
After changing the EBS volume size, connect to EC2 using SSH etc. and expand the file system.
https://docs.aws.amazon.com/ebs/latest/userguide/recognize-expanded-volume-linux.html
You need to go to Support Center, Your support cases
to close the Limit Increase support case as Resolved, before requesting another service quota increase
g5.2xlarge has 8 vCPUs. After support case is closed as resolved, request a new limit of 16 vCPUs for g5.4xlarge.
Are you launching a on-demand or spot EC2 instances? They have separate quota limits. (assuming US-EAST-1 Region)
- Running On-Demand G and VT instances: https://us-east-1.console.aws.amazon.com/servicequotas/home/services/ec2/quotas/L-DB2E81BA
- All G and VT Spot Instance Requests: https://us-east-1.console.aws.amazon.com/servicequotas/home/services/ec2/quotas/L-3819A6DF
Regarding EBS size, you can refer to article How do I increase or decrease the size of my EBS volume?
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