Re: Cost Justifications

Chevette? That would cool a POWER7:-) It's from a Ford Expedition!

- L

On 3/9/2011 1:23 PM, Jim Oberholtzer wrote:

> We do indeed water cool the system, sort of.....
>
> If your at the COMMON Annual Conference come by the session we are doing
> on cloud computing and we will show pictures of it. That said, Larry
> got a new car radiator from one of the vendors nearby (he is in Grand
> Rapids MI after all), I think from a Chevette. The air is channeled up
> through that radiator that absorbs the heat, warming the water which is
> dumped into the preheat tank for the water heater. The resulting cold
> air is then blown down onto the floor in front of the machine. Most of
> the cooling for the entire system is done that way, all 20 LPARs worth.....
>
> Jim Oberholtzer
> CEO/Chief Technical Architect
> Agile Technology Architects, LLC
>
>
> On 3/9/2011 11:54 AM, DeLong, Eric wrote:

>> So you have water cooling on Frankie? How did you manage that?
>>
>> -Eric DeLong
>>
>>
>> -----Original Message-----
>> From:midrange-l-bounces@xxxxxxxxxxxx
>> [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DrFranken
>> Sent: Wednesday, March 09, 2011 8:04 AM
>> To: Midrange Systems Technical Discussion
>> Subject: Re: Cost Justifications
>>
>> OK I wrote a certification question on the ratio between input power and
>>
>> output heat and got booed off the stage. SO I will simply tell you the
>> answer. For each KW of input power (1000 Watts) you will get 3413 BTU of
>>
>> heat output. Now since a teeny tiny little bit of that 1000 watts went
>> into creating LED light (a VERY teeny bit) and some into noise generated
>>
>> by the fans you might get a measly 3410 BTU of heat. Point is that it's
>>
>> a straight line relationship between input power and output heat. It's
>> fairly common for HVAC guys who know there stuff to ask what the total
>> power input to the data center is, what the percentage load on the UPS
>> is, and use that number as a basis for calculating cooling requirements.
>>
>> If you put 100KVA IN you will need to get 341,300 BTU out somehow.
>>
>> Now how much electricity it takes to remove those BTUs can vary A LOT.
>> In very cold climates, outdoor air can be drawn through filters to cool
>> the place (devices called 'economizers') and that's cheap. In hot
>> climates very large amounts of A/C are used to cool such rooms and that
>> cost can rival the power of the systems being cooled. In the FrankenLab
>>
>> from about October through March 100% of the heat generated is turned
>> into domestic hot water and then heat for the house. In the summer it
>> ends up in the swimming pool or down a dry well. Very economical indeed.
>>
>> - Larry 'DrFranken' Bolhuis
>>
>> On 3/8/2011 6:09 PM, Evan Harris wrote:

>>>> What's the heat differential ? And the power requirement for the
>>>> cooling equipment to handle it ?:)
>>>>
>>>> As you've pointed out the OP should also consider the maintenance and
>>>> license costs if any of keeping an existing machine versus upgrading
>>>> as this is often a simpler sell to management as it's a direct cost.
>>>>
>>>> On Wed, Mar 9, 2011 at 9:45 AM, DrFranken<midrange@xxxxxxxxxxxx>

>> wrote:

>>>>>> Well the 720 and the 250 are about a wash in 'spec power' at 750 amd

>> 782

>>>>>> watts respectively. That said, what you GET for those watts is a

>> little

>>>>>> different. The biggest 250 was 75 (Seventy five!) CPW (20

>> interactive)

>>>>>> while the teeeeeeniest 720 is nearly 6,000 CPW (one core) and as much

>> as

>>>>>> 46,300 with all eight cores going. So a one core 720 is equal to

>> Eighty

>>>>>> 250s in CPU capability. IN practice I would expect the 720 to draw

>> far

>>>>>> less than that and I measured a 2-core system with 6 drives closer to
>>>>>> 100 Watts with IBM i 7.1 simply idling. (No user work at the time.)
>>>>>>
>>>>>> The 720 also comes with a 3 year warranty so you drop maintenance

>> cost.

>>>>>> I also did a comparison of a POWER5 550 to a POWER7 750 and the ratio
>>>>>> there is 100 to 1 on power per CPW. That is the 750 generates 100

>> times

>>>>>> more CPW per input Watt than a 550! That's a lot of savings!
>>>>>>
>>>>>> - Larry
>>>>>>