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Amazon Web Services EC2 – Part 5: Sizing, Costs and SLA

March 15th, 2009

Sizing and Costs

EC2, like the other services in AWS are pay as you go, pay for what you use, services. As I mentioned above, you basically pay for the power you use which is a CPU per hour charge, bandwidth and storage. Linux and Windows guests have a different pricing menu. I am listing the prices current as of Dec 2008. I recommend you always check at aws.amazon.com to verify current pricing before making a commitment.

Instead of buying or leasing a specific type of hardware (that you would then be responsible for upgrading over time), AWS computing power is based on an EC2 compute unit. An EC2 compute unit is the equivalent processing power of a circa 2007 1.0-1.2 Opteron or Xeon CPU processor.

Instance Type

Memory

Compute Units

Storage

Platform

Linux CPU/Hour

Windows CPU/Hour

Small

1.7GB

1

160GB

32-bit

$0.10

$0.125

Large

7.5GB

4

850GB

64-bit

$0.40

$0.50

Extra Large

15GB

8

1690GB

64-bit

$0.80

$1.00

High CPU, Medium

1.7GB

5

350GB

32-bit

$0.20

$0.30

High CPU, Large

7GB

20

1690GB

64-bit

$0.80

$1.20

Table 1: EC2 Sizes and Pricing

Data Transfer

US per GB

Transfer Into EC2

$0.100

First 10TB Out of EC2

$0.170

Next 40TB Out of EC2

$0.130

Next 100TB Out of EC2

$0.110

Out over 150TB

$0.100

Within the Same Zone (Private IP)

$0.00

Between Zones (Same Region)

$0.01

Outside of the AWS Network

$0.01

Table 2: ec2 Data Transfer Costs

SLA

Amazon warrants uptime to be 99.95% per service year. Amazon will credit your account for any unplanned downtime. You do not need to run for an entire year before claiming a credit for any downtime. You can get additional details at http://aws.amazon.com/ec2-sla/

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