Re: DASD arm worksheets

We've used the Second Opinion Service from MPG's Performance Navigator
(thru our BP) in the past to verfiy hardware purchases, but i'm always
curious as to how much nitty-gritty detail they delve into...

                                                                       
             Larry Bolhuis                                             
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Kendall speaks the truth. The old worksheets were at a point of just not
being able to cover the variety of cabinets, buses, drives, RAID cards,
protection type, processors, and other factors. And of course LPAR
complicated them as well.

So do the IO Math and you'll have a system that can do the work.

- Larry

Kendall Kinnear wrote:
> IBM has changed to a I/O per second calculation for sizing disk on the
newer models. The way I do it is to collect performance data to determine
the current average I/Os per second. I then add a growth factor and
multiply that by the number of drives on the system. I then divide that
number by the number of I/Os per second the new disk subsystem can support
per drive. That can be anywhere from 40 to 60 depending on how conservative
you want to be. This will give an estimate of the number of drives to
propose.
>
> Kendall Kinnear
> Consulting System i5 Architect
> Stonebridge
>
> Phone: 214-676-3146
> email:   kendall.kinnear@xxxxxxxx
>
> Sent from Windows Mobile 5
>
--
Larry Bolhuis IBM eServer Certified Systems Expert:
Vice President iSeries Technical Solutions V5R3
Arbor Solutions, Inc. iSeries LPAR Technical Solutions V5R3
1345 Monroe NW Suite 259 iSeries Linux Technical Solutions V5R3
Grand Rapids, MI 49505 iSeries Windows Integration Technical Solutions V5R3
IBM eServer Certified Systems Specialist
(616) 451-2500 iSeries System Administrator for OS/400 V5R3
(616) 451-2571 - Fax AS/400 RPG IV Developer
(616) 260-4746 - Cell iSeries System Command Operations V5R2

If you can read this, thank a teacher....and since it's in English,
thank a soldier.


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