Device mappings in EC2

Andrew Wilkins andrew.wilkins at
Fri Jul 18 02:47:33 UTC 2014

On Mon, Jul 14, 2014 at 10:09 PM, Henning Eggers <henning at> wrote:

> Hi,
> this is a follow-up to these two:
> The new m3 EC2 instances come with fast SSD instance (ephemeral) storage
> volumes. To make these available, a device mapping has to be specified at
> instance launch time. AFAICT there is no such option in juju.

FWIW, m3.xlarge at least does come up with the instance storage mounted at
/mnt. It appears that m3.2xlarge does not have a default mapping.

On askubuntu Jorge suggests specifiying constraints in such a ways, that an
> old instance type is selected. In the LP bug on the other hand Kapil is
> calling for the complete removal of these old instance types. These two
> seem
> to be counter-productive. ;-)
> What I would need is a way to specify a device-mapping when launching a
> service or maybe a machine. I don't think it would make sense to change
> this
> on a per-unit base assuming that units are configured identically.
> Is there any solution for this in the pipeline?
> Thanks,
> Henning
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