> Single post racks as you call them are often called relay racks. They
> aren't for mounting equipment in they are for mounting patch panels and
> stuff like that. Machines are too big to mount in them. Also you
> should securly mount the relay racks to the ground.
>
> You should use cabinets for gear not relay racks.
The issue with typical cabinets is with cooling; you have to
plan your equipment configuration carefully to figure out if
you should choose solid doors with a roof exhaust fan and
create airflow using a chimney effect or with mesh doors. Even
so, your safe thermal limits are usually pretty much around 15,000
BTU/cabinet (~40A@120V) with mesh doors, somewhat less for solid.
If you're using 4U machines without lots of disk there's a good chance
this won't be a problem, but if you're planning to fill an entire
42U of 1U or 2U systems you need to watch it. Cabinets do offer 1
advantage; they can offer somewhat enhanced physical security.
There usually aren't significant problems using relay racks as long as
a) you plan for sufficient airflow to facilitate cooling b) you
allow sufficient room between rows for the equipment, and
c) the front rails/ears on the equipment are strong enough to safely
hold it on its own. When properly secured you can easily and
safely mount even larger equipment like Cisco 12016's and Juniper
M160s (been there, done that more than once). A lot of the rack-mount
Sun gear also racks up OK.
The only real PITA comes when you need to install Dell or Compaq
equipment with other vendors equipment in the same rack, but this is
true regardless of using cabinets or relay racks.
It's also true that relay racks need to be properly secured, either
directly bolted to the floor, or in the case of raised floor,
using hardware to ultimately secure them to the subfloor.
> [EMAIL PROTECTED] wrote:
>
> >
> > --center mount brackets rarely come with the case,
> > and screwing a 2U system onto a single post rack can cause
> > rolling-rack-tipover (is that a beer?) or screw-thread stripping
> > (too much rear weight hanging on a small 2U == too much leverage).
> >
>
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