Both Amazon and OpenStack Cloud have disk information for flavors.

Amazon:

In https://github.com/ManageIQ/manageiq/blob/538d51cc0e81d996e8c0fd11c5b72fc3dca813df/app/models/manageiq/providers/amazon/instance_types.rb#L120-L121

>     "m3.medium" => {
>       :name                    => "m3.medium",
>       :family                  => "General Purpose",
>       :description             => "M3 General Purpose Medium",
>       :memory                  => 3.75.gigabytes,
>       :vcpu                    => 1,
>       :ebs_only                => false,
>*******:instance_store_size     => 4.gigabytes,
>*******:instance_store_volumes  => 1, # SSD
>       :architecture            => [:x86_64],
>       :virtualization_type     => [:paravirtual, :hvm],
>       :network_performance     => :moderate,
>       :physical_processor      => "Intel Xeon E5-2670v2",
>       :processor_clock_speed   => 2.5, # GHz
>       :intel_aes_ni            => true,
>       :intel_avx               => true,
>       :intel_avx2              => nil,
>       :intel_turbo             => true,
>       :ebs_optimized_available => nil,
>       :enhanced_networking     => nil,
>       :cluster_networking      => nil,
>       :vpc_only                => false,
>     },

OpenStack:

> [root]# nova flavor-list
> +----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
> | ID | Name      | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
> +----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
> | 1  | m1.tiny   | 512       | 1    | 0         |      | 1     | 1.0         | True      |
> | 2  | m1.small  | 2048      | 20   | 0         |      | 1     | 1.0         | True      |
> | 3  | m1.medium | 4096      | 40   | 0         |      | 2     | 1.0         | True      |
> | 4  | m1.large  | 8192      | 80   | 0         |      | 4     | 1.0         | True      |
> | 5  | m1.xlarge | 16384     | 160  | 0         |      | 8     | 1.0         | True      |
> +----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
> 
> [root]# nova flavor-show m1.medium
> +----------------------------+-----------+
> | Property                   | Value     |
> +----------------------------+-----------+
> | OS-FLV-DISABLED:disabled   | False     |
> | OS-FLV-EXT-DATA:ephemeral  | 0         |
> | disk                       | 40        |
> | extra_specs                | {}        |
> | id                         | 3         |
> | name                       | m1.medium |
> | os-flavor-access:is_public | True      |
> | ram                        | 4096      |
> | rxtx_factor                | 1.0       |
> | swap                       |           |
> | vcpus                      | 2         |
> +----------------------------+-----------+

We should capture both the image size and the volume count.  Since OpenStack doesn't provide volume count, it will always be one as long as the disk size is non-zero (meaning, non-ephemeral).  See http://docs.openstack.org/openstack-ops/content/flavors.html.