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- Now let's talk about Instance
Store Volumes in Amazon EC2.

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Instance Store Volumes are volumes that

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essentially come with the EC2 Instance.

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They're what we might consider
built in to the EC2 Instance,

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at least those instances
that actually include them,

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not all of them do.

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And so the nice thing about
Instance Store Volumes are

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one, you're not paying anything extra,

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they're already included in
the cost of the EC2 Instance.

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We can get very high IOPs,

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upwards of a hundred thousand plus IOPs,

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with these particular Instance Stores.

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But, what we trade for that,

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is the fact that they are ephemeral.

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It means that when we stop
or terminate that machine,

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the data on that drive will be gone.

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Amazon does not give us
the ability to perform

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snapshots on Instance Volumes.

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So there are plenty of
customers that are using

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these Instance Volumes so that
we can get that high degree

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of IOPs but they are also leveraging

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some kind of other software,

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perhaps a custom-written application

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or a third-party application,

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that helps back up that data to either S3

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or the Elastic Block storage,

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some other storage mechanism

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that has a longer life
span and more durable.

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So, again, it's really
important to remember

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that while we do get
this high degree of IOPs,

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the data on this drive is
ephemeral and could be gone,

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it will be gone, when that machine is

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either stopped or terminated.

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Just as an example here, this
is not a comprehensive list,

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but I wanted to give you an
example of the types of volumes

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that we might expect to see

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with different types of machines.

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So one example here is the M3 Medium.

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The M3 Medium would come with one

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4-gig SSD volume.

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Whereas the M3 Extra Large

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would come with two 40-gig volumes.

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And yes you could raid
them if you wanted to,

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you could put them into
a logical volume manager.

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Some of the other
instances you can see here,

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the D2 8 Extra Large comes with about

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48 terabytes worth of volumes,

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that is 24 2-terabyte devices

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that are included with the
hourly cost of that machine.

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And that is Instance Store Volumes

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within Amazon EC2.