Thanks all information, I will turn on "critical storage" on WLM and add
additional 2G real memory to existing LPAR. Let' see any improvement
在 2009/9/3下午3:29，Ron Hawkins <[email protected]>寫道：
Tommy,
It is not just the paging rate, but also the time to satisfy those
page-ins.
If you have all your page datasets on the same paths and parity groups
then
the page-in time will be elongated by any concurrent requests you have.
Someone correct me if I'm wrong, but aren't unchanged pages selected for
Page-out first? If my memory is correct then any storage shortage is
likely
to see the pages from your CICS region repeatedly paged out with a bit
flick
ahead of other ASID because they are still unchanged on AUX. If you can
establish if this is happening then you may be able to resolve the problem
using Ted's suggestion for Memory Critical, and bouncing the CICS region
to
get those pages off the Locals.
Failing that, realize that Paging itself is quite cache unfriendly. If you
check the cache hit rates on your Locals you'll usually find a very low
hit
rate, so you are going down to the disk drives to satisfy the page fault.
You may want to ask your storage vendor for a Flashdrive try and buy, or
try
FlashAccess if you have HDS. This would at least speed up resolving the
Page
Fault enough to prevent the timeouts.
Ron
> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:[email protected]] On
Behalf Of
> Tommy Tsui
> Sent: Wednesday, September 02, 2009 5:52 PM
> To: [email protected]
> Subject: [IBM-MAIN] 回覆：Re: 回覆：Re: paging in rates and real memory
>
> Hi all,
>
> We got 5GB in our production LPAR and some of CICS transactions always
time
> out because of paging. Is there any other way to improve the paging rate
> instead of add more real memory?
>
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