I came across these two items of non-integer rack unit height:
1. This rack mount kit which seems to be trying to make the best of the slightly-taller-than-1U form factor of the Cisco ASA5505.
2. This 1.5U Server Case that espouses the merits of a case height between 1RU and 2RU.
My questions are as follows:
A. (1) seems to protrude 1/8 RU above and below the rack unit it is bolted in. Is there any way to make use of the 7/8 RU remaining above and below? Or would using that bracket effectively consume 3 RU?
B. Are there any gotchas I should be aware of (like rack rail bolt patterns not working out, etc) when I consider one of these non-integer RU server cases like (2)?
You're supposed to use the 1.5 rack-unit equipment in pairs... But that's really a nonstandard setup.
For the Cisco ASA 5505, it's really a desktop/tabletop SOHO device. When I use them in data centers or rack setups, I usually place them on a shelf (which is usually a fraction of a rack-unit as well). Nobody uses a rackmount kit for that device... Well, maybe, but I have yet to see one in the field.