Closing the Gap between Cloud Providers and Scientific Users - Cloud Computing with e-Science Applications - page 134

User A User B

e-Clouds Server
Web Portal
Resource Manager
Database

e-Clouds Te am

Heroku

Amazon Simple Queue Service (SQS)

Pre-scheduling Scheduling

Amazon Elastic Clound (EC2)

Virtual Cluster
User A
Small instances

Virtual Cluster
User B
Small instances

AG

AG

AG AG

AG AG

Simple Storage Service (S3)

App
Bucket

Data
Buckets

e-Clouds
Bucket

e-Clouds
Agent (AG)

Bucket
User A

Blast

Maxent

Base
Virtual
Machine

Bucket
User B

Amazon Web Services (AWS)

FIGURE 6.8
e-Clouds actual deployment.

6.5.4.1 Storage Cost

The user pays at the end of each month for the maximum amount of data that
he stored during that period of time. For simplicity, the minimum charging
unit is the gigabyte, so everything below that just rounds up. The formula for
calculating total storage cost is then really simple:

Total storage cost = (Maximum # of gigabytes stored) * (Cost per gigabyte)

6.5.4.2 Computational Cost

Following some providers' trend (including AWS), the computational
resources are charged on an hourly basis. This means that for every hour or