[cs615asa] Regarding Stopping Instances

[Jan Schaumann]

mmeladat at stevens.edu wrote:
 
>  In the Instances section of AWS the list of instances are listed, of
> which the Root Device Type is ebs only for Fedora Core 8, while for the
> rest its Instance store. I can stop the instance that is of type ebs, but
> only terminate the instance that is of Root device type as instance store.

That's correct -- EBS (Elastic Block Storage) is a different storage
concept from instance storage.  That is, data stored on EBS can survive
a "reboot" and be used after the instance has been stopped, while
instance storage is tied to the lifetime of the instance.

Hence, you can't "stop" an instance-storage backed instance -- it only
knows the difference between running and being terminated.  An EBS
backed instance however can be stopped (meaning the host is "shut down",
but the data stored on the EBS is still there and can be reused if
another instance is created).

You should also be able to terminate an EBS-backed instance, which means
that you're completely destroying the host and any data you had stored.

Review the EC2 guide around the different storage modals for more
details.

Hope this helps,
-Jan
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