• Subject: Re: Setting up ASP
  • From: email@xxxxxxxxxxxxxxxxxxx (James W Kilgore)
  • Date: Thu, 14 Oct 1999 16:06:27 -0700
  • Organization: Progressive Data Systems, Inc.

Well, you know this ones coming: It depends. <g>

If your question is does having the OS in one ASP and my data in another
buy me anything, I'd have to say no.

We have taken some user files and moved them to separate ASP's and it
worked for us.

Using your situation in relation to ours, let's say we have 30 drives
(6713) and are pushing 70% capacity.  So we go out and buy 6 more drives
(6607).  We also have a very large historical file that is only added
to.  No changes.  It is used by everyone, but not often during the day
(and usually by <5% of the users at exactly the same time).  But when it
does get hit, it drags the whole system.  Let's face it, it's splattered
all over the 30 drives and turns into an arm hog.

We add the 6 new drives (without RAID) in their own ASP AND move the
historical file to it.  Now the remaining 30 drives are pushing 40%
capacity and any functions performed against the history file do not
fight for arm time.

As a general rule of thumb one would want to have as many arms covering
as much data as possible in the same ASP and use some other method of
performance tuning.  But in this particular case, using a separate ASP
-was- the performance tuning we needed.

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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