• Subject: Re: Setting up ASP
  • From: Larry Bolhuis <lbolhui@xxxxxxx>
  • Date: Thu, 14 Oct 1999 12:56:30 -0400
  • Organization: Arbor Solutions, Inc

Eric,
 
 This is not a simple question to answer as usual, it depends.  If you have some
part of your date that is accessed very very frequently it is pssible that you
could get a performance benefit by putting it into a separate ASP.  WHat you 
MUST
look out for is that the ASP should be in a completly separate RAID set or sets
or IO to the ASP sharing the set will impact it, AND you must provide enough 
arms
to satisfy the IO requirement in that ASP.  Generally I have found that just
having enough total arms in the system for the required IO load is the key to
good performance.  36 drives on a 640 would not generally be enough.

 - Larry

eric.delong@pmsi-services.com wrote:
> 
>      We've been trying to track down some performance problems, and the
>      question has arisen: Does defining an ASP for our application data
>      have any performance benefits? We currently have all DASD in RAID set
>      in the system ASP.
> 
>      The system in question is 640 (2237).
>       DSKSTS shows units 1-30 type 6713
>                         31-36 type 6607
> 
>      tia
>      eric.delong@pmsi-services.com
> 
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-- 
Larry Bolhuis         | What do You want to Reload today?
Arbor Solutions, Inc  | Don't throw your PC out the window,
(616) 451-2500        |  throw WINDOWS out of your PC.
(616) 451-2571 -fax   | Two rules to success in life:
lbolhui@ibm.net       | 1. Never tell people everything you know.
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