Hi Ron,
Yes, it appears to be disconnect time. No IOSQ to speak of.
Thanks!
BobL
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf Of
Ron Hawkins
Sent: Monday, March 19, 2012 9:47 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: DASD Mod9/Mod54
Bob,
On reason why 3390-54 may have higher response time than 16x3390-9 is that the
underlying volume is striped over less physical disk drives.
Ignoring wide striping, in most DASD volume layouts a single volume is spread
over two, four or eight disk drives. One 3390-54 will there have 2 to
8 physical disk drives backing it, whereas the 16x3390-3 could 16 times as many
disk drives (32 to 256 HDD). How many drives a workload is spread over with
3390-3 will depend on your logical device layout, but there is a natural
"flattening" of the back end IO load with smaller, well distributed volumes.
If this is the problem you will see a larger disconnect time in the 3390-54
response time.
If you are seeing IOSQ time then you need to look at your HyperPAV or PAV
allocation.
Ron
> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On
> Behalf Of Lester, Bob
> Sent: Monday, March 19, 2012 3:57 PM
> To: IBM-MAIN@bama.ua.edu
> Subject: [IBM-MAIN] DASD Mod9/Mod54
>
> Hi Folks,
>
> With todays' modern disk arrays, is there any reason (z/OS based
> or
other)
> that response time for my Mod54s is consistently higher than for my Mod9s?
>
> Assume identical workload against each, single array with
> multiple
LCUs.
> RMF says the LCUs are pretty well balanced. Single image. Pretty
> simple setup.
>
> Thoughts?
>
> Thanks!
> BobL
>
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