Re: Sizing a new iSeries

[Sue Baker <smbaker@xxxxxxxxxx>]

Karl Keller wrote in gmane.comp.hardware.ibm.midrange at Tue 28
Jan 2003 03:59:07p: 

>         I was creating a ballpark proposal based on some the
>         pricing i've 
> seen for a new iSeries. This new box would replace a model 510
> with a CPW rating of 112 and a model 500 with a CPW rating of
> 44. We have about 100 interactive 5250 users so that takes us
> out of the new model 800's. So the next step up would be a
> model 810. The entry level 810 with the enterprise software
> has a batch and interactive CPW rating of 1020. So I'm
> thinking that this is really overkill but our only option. I
> contacted our 3rd party sales rep to get some ball park
> pricing on the additional software we would need and told him
> what I was thinking regarding the Model 810. He informed me
> that my CPW assumptions were way off base. He said that as a
> rule of thumb, for every 50 CPW of interactive, you need 1000
> CPW of batch! 
> 

A couple of possibilities for you.... 

First, can you take advantage of the enhanced web-facing that was 
announced along with the new models?  If you can, you might still 
be able to utilize an 800 as your target system.

Second, if you are seeing good performance on your existing 
systems for both batch and interactive, there is no reason to add 
additional CPW to account for batch in addition to interactive.  
The 500 and 510 have no "interactive" CPW, all cycles are 
available for all workloads.  The new boxes are the same with the 
Enterprise Editions.  So, you select the system that's the 
closest fit on a total CPW basis.  

Finally, the 800 still might not be out of the running for you.  
Even though it tops out at 50 CPW for 5250 data stream, it may be 
that's all you really use in your existing environment.  Some 
analysis of collected performance data can prove this.

-- 
Sue
iSeries Advanced Technical Support
Rochester, MN