topic Re: Rack U's in General in Servers - General

Rack U's in General

Jim_366 — Mon, 14 Mar 2005 17:09:35 GMT

Trying to find out if there is an industry standard for where a U number is started at the bottom of a rack? Do they call the bottom spsce 0 or 1?

Re: Rack U's in General

kcpant — Tue, 15 Mar 2005 00:44:29 GMT

Hi Jim,

AFAIK, the starting point of rack cabinet is marked as 0U, and then measured 1,2 and so on , in all directions ( dimensions).

Re: Rack U's in General

Jim_366 — Tue, 15 Mar 2005 09:23:57 GMT

Thanks...just to clarify the starting U space is labeled as 0.

Re: Rack U's in General

timmy b. — Tue, 15 Mar 2005 11:41:27 GMT

Jim,
Just a couple of things for you.

A "U" is 1.75 inches.

Not all cabinets count from the bottom to the top, some have top down numbering.

I hope this helps.

Good Luck - Tim

Re: Rack U's in General

Jim_366 — Tue, 15 Mar 2005 13:05:00 GMT

Thanks...Are all HP racks labeled the same? Starting with 0 as the first U.

Re: Rack U's in General

timmy b. — Wed, 16 Mar 2005 18:21:28 GMT

Jim
HP racks (when labeled) will always start with 1U at the bottom.

When you hear the term 0U it will usually mean a space that is out of the normal "equipment" rack space, meaning cable management or ventilation areas.

More tidbits:
The older style of HP racks have sheet steel sides, are "quartz" in color, and are called Rosebowl or Rosebowl 1.

The newer style is called Rosebowl II, is also quartz but can also be graphite in color, and has removeable plastic side panels of either 8U or 9U size. (9U is located ONLY at the bottom of the rack, all others are 8U) http://www.hp.com/racksolutions

The newest racks are the 10000 series, along with it's predecessor on the Compaq side, the 9000. http://h18004.www1.hp.com/products/servers/proliantstorage/racks/10000series/benefits.html#quality

I hope this helps.

Good Luck - Tim