On Fri, 11 Jul 2008 11:13:04 -0400, John Kington
<[EMAIL PROTECTED]> wrote:
>No numbers but a story from personal experience. When I first implemented
>SMS, I setup a VIO storage group with a limit of about 10 cylinders on a
>3390 and made any requests over 10 cylinders go to dasd. About six years
>later, the tape guy was making changes to STK HSC database which caused it
>to increase in size to around 12 cylinders (hsc was created using vio and
>then gener'ed to dasd, IIRC). He noticed that his runtime on the hsc gen
>increased more than triple. This was on a 9672 G5 box using EMC 8830 escon.
>I can not imagine more recent equipment could make up this difference.
>Regards,
>John
>
I just tried that and the CDS creation program won't let you use VIO as
the output.
But I did run an IEBGENER test of a 350 CYL CDS to DASD and then
to VIO. Here are the results:
DASD:
IEF373I STEP/JS010 /START 2008193.1049
IEF374I STEP/JS010 /STOP 2008193.1050 CPU 0MIN 01.42SEC
SRB 0MIN 00.74SEC VIRT 104K SYS 328K EXT 4K SYS 11812K
VIO:
IEF373I STEP/JS010 /START 2008193.1050
IEF374I STEP/JS010 /STOP 2008193.1051 CPU 0MIN 02.06SEC
SRB 0MIN 00.69SEC VIRT 104K SYS 324K EXT 4K SYS 13856K
I ran several test and wall clock time was slightly less with VIO.
Now time to go change the SMS rules back on my sandbox plex....
Mark
--
Mark Zelden
Sr. Software and Systems Architect - z/OS Team Lead
Zurich North America / Farmers Insurance Group - ZFUS G-ITO
mailto:[EMAIL PROTECTED]
z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/
Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html
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