Dennis,
If the thread count for the file is one then you won't have a problem.
You can calculate if you will have an IOSQ problem by calculating the
weighted average service time across your 27x3390-3 and applying Little's
Law to one tenth of the total IO rate.
If the weighted average service time comes out at 2ms, and the total IO rate
is 200/sec then the number of concurrent IO per volume will be:
(200/10)*0.002=0.04
So you're unlikely to have an IOSQ problem if you consolidate from 27 to 10.
However if your total IO rate is 2000/sec and weighted average response time
is 6ms then the concurrent IO per volume will be:
(2000/10)*0.006=1.2
That means you're likely to have an IOSQ problem.
A bit of SAS code across your weekly MXG PDB.TYPE74 and a proc univariate on
the Little's Law result of every RMF interval and you'll pretty well know
where you stand.
Ron
> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:[email protected]] On
Behalf Of
> Dennis McCarthy
> Sent: Tuesday, January 24, 2012 5:28 AM
> To: [email protected]
> Subject: Re: [IBM-MAIN] Going from mod-3 to mod9
>
> Hi Joel,
>
> We do NOT have any PAV's. We are a pretty small shop. One production LPAR
and
> one test (sandbox for me). The VSAM file in question is open to a single
CICS
> region. Give that additional information, can I expect a negative impact
on
> response time going to the MOD-9's?
>
> Dennis
>
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