zAke,
In a default configuration, the Aruba contoller will NOT select the DFS channels as "allowed" for ARM to assign to the APs due to the concerns I mentioned, so your last statement is, in general, correct, if you select 5Ghz, the DFS channels will not be used until you enable them. You can see this by looking at the regulatory domain profile in use on the controller for that region ad checking the allowed channels.
A couple other things to note about 2.4Ghz vs. 5Ghz (including 5Ghz DFS channels):
- 20Mhz channels you list overlap each other on 2.4Ghz and cannot all be used at the same time in the same area (or should not anyway), typically only 1, 6, and 11 are non-overlapping 20Mhz channels that can be leveraged on 2.4Ghz. This reduces even further the number of available channels on 2.4Ghz for HD design
- 20Mhz channels you list DO NOT overlap each other for 5Ghz and all can be used for HD design (must consider DFS nuances I mention)
- By default, Aruba will channel bond the 5Ghz channels and NOT the 2.4Ghz channels in an 11n deployment. This will reduce the number of available channel on non-DFS 5Ghz to 4 instead of 9.
- You will notice in the HD VRD that we make mention about ability to possibly get more performance/capacity in an HD design by disabling channel bonding on 5Ghz and using all 9 x 20Mhz channels in a single area as opposed to 4 x 40Mhz channels.
Hope that helps.
Regards,
Austin