Re: DASD arm worksheets

Yeah, I also use that tool.  It pretty much tells us that we need to add
ALOT of workload to scratch the surface of any of these new boxes. ;)

The controller cache is really the only performance snag i've run into with
our workloads here... that's why i'm worried I might have to step down from
a 2757/2780 level controller to a 40mb cache (if we need to stay in a
single CEC system... that may be hard to do anyway with looking at even a
single IXS card).


                                                                       
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Have you looked at IBM'sWorkload Estimator? It is a sizing tool available
to you at

http://www-912.ibm.com/estimator

See what you get and let us know if it helps.

Vern

-------------- Original message --------------
From: Larry Bolhuis <lbolhuis@xxxxxxxxxx>

> 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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