[StarCluster] cluster creation best practice

[Ramon Ramirez-Linan]

Jennifer,

Thanks for your answer although I was aware of all those limits and in fact
we requested the limit increased a while ago.

My question was more about how to check if AWS has the resources that I
need before asking StartCluster to start creating the cluster.

If I need a 300 nodes cluster and it fails after 250 due to AWS not having
enough availability of an instance type, I will still have to pay for the
250 nodes for at least an hour.
After the 250 nodes have been created I have the option of keep trying to
add more nodes to complete to 300 but I think to optimize the cost it would
be better if I have a way of knowing in advance if AWS is going to have 300
EC2 for me.



PS: I am an AWS Solutions Architect and my company is an APN and reseller
partner.


On Thu, Nov 6, 2014 at 12:30 PM, Jennifer Staab <jstaab at cs.unc.edu> wrote:

>  AWS does put limits on resources any one AWS account can use (see here
> <http://docs.aws.amazon.com/general/latest/gr/aws_service_limits.html> for
> details).  Specifically see here
> <http://aws.amazon.com/ec2/faqs/#How_many_instances_can_I_run_in_Amazon_EC2>
> for limits regarding EC2s. You can make requests to AWS to increase limit
> bounds. Also note there are certain actions AWS users are not allowed take
> (see here <http://aws.amazon.com/aup/> ), if you violate any of those
> policies Amazon has right to deny service to you.
>
> And another thing to consider is the time of the year. AWS started because
> Amazon wanted to make more use of its resources when they were less than
> active.  I'm not sure what proportion of AWS resources are still used by
> Amazon itself, but I would think with holidays approaching the EC2s might
> be less than available as compared to the start of 2015.
>
> Good Luck.
>
> -Jennifer
>
>
>
> On 11/6/14 11:41 AM, Ramon Ramirez-Linan wrote:
>
> I need to create a 300 nodes cluster.
>
>  1. if there a way to query AWS in advance to see if they have the 300
> EC2 availables? I dont want to find out after 299 nodes that they out of
> that EC2 type. I am not sure if StarCluster already check for that.
>
>  2. Would it be better to create the cluster with less nodes and then add
> them 20 at a time?
>
>  Thanks in advance
> Ramon
>
>
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