Engine Yard Developer Center

Use M2 instances

This is documentation for AWS M2 instances. M2 instances provide sustained memory bandwidth, superior I/O performance, support for EBS optimization, as well as support for lower latency, low jitter, and very high packet per second performance. M2 instances are recommended for applications that require high memory performance at the best price point per GB of RAM.

M2 instances must be launched into an Amazon Virtual Private Cloud (VPC); they are not supported on the EC2-Cloud platform. Amazon VPC enables you to launch AWS resources into a virtual network that you've defined.

Note: You cannot change the instance type of an existing EC2-Cloud instance to a M2 instance type.

Memory Optimized (M2)

The HVM instance types, available in all AWS regions, are:

  • Large
  • Extra Large*
  • 2x Extra Large* Hidden behind feature flag
  • 4x Extra Large* Hidden behind feature flag

* Extra large, double extra large, and quadruple extra large instances are also available as EBS optimized instances.

Get started with M2 instances on Engine Yard

This document describes how to use M2 instances with Engine Yard.


Configure M2 instances

You can configure M2 instances when you add new instances to a new or existing environment.

Note: We recommend testing in a staging environment before applying changes in a production environment.

To add a new M2 instance

  1. Ensure that you meet all the prerequisites above.

  2. Add an instance in the usual way.

    See the database docs for more information about adding a database instance to an environment.

  3. Select the appropriate General Purpose M2 instance size of your choosing.

  4. Click Add to Cluster (or Boot This Configuration, if you are re-booting an existing environment).

    See the related documentation for more information on adding instances to your environment.

    Note: If you are adding a M2 database instance, you also need to click Apply to update the database.yml file.

Verify M2 instances

Note: When you are testing in staging, consider the differences between your test and production loads.

To verify M2 instances

  1. Ensure that instance provisioning worked and the instance is running.

    In general, that is enough of an indication that the M2 instance is working fine.

  2. Review the Troubleshooting tips below for more information.
  3. If this is a staging environment and you are finished with testing, be sure and stop any M2 instances to avoid unnecessary charges.
  4. Stop any unneeded M2 instances to avoid unnecessary charges.


You might have these questions about M2 instances.

How can I use the SSDs on these instances?

You can leverage the SSDs as needed via custom Chef; be aware that there is no ability to create snapshots of SSDs.

How much does it cost?

See the pricing page for details.


This table contains troubleshooting tips related to M2 instances.

The M2 instances do not appear in the drop-down list. If you have had an Engine Yard account for a while, you might need to create a new Engine Yard account in order to have VPC and use M2 instances. Older Engine Yard accounts did not have VPC.
When I clicked HTTP on the app server, I received a 500 Internal Server Error. If this is the first time provisioning, wait a few minutes and try again.

More information

This table provides other resources related to M2 instances.

For more information about...See...
Adding an instance to an environment Add Instances to an Environment
Amazon Virtual Private Cloud (VPC) VPC on Engine Yard
Hardware-assisted virtual machine (HVM) HVM vs. PV
Supported AWS instances on Engine Yard AWS Instance Type Support
Upgrading your environment Upgrade Guide
Adding a database instance to an environment Add a database replica (slave) to an existing environment
EBS optimized instances EBS optimized instances

If you have feedback or questions about this page, add a comment below. If you need help, submit a ticket with Engine Yard Support.

Was this article helpful?
0 out of 0 found this helpful
Have more questions? Submit a request


Please sign in to leave a comment.

Powered by Zendesk