Denis,
OS390 2.10 and TSM 4.2.1
My database is a bit smaller at 18 gb used pages, but then my buffpoolsize is a
lot
smaller at 48 mb and I see Cache Hit Pct over 98%
I know it probably does not work like that but extrapolating from mine your
buffpoolsize
should be 80 mb.
So maybe you should try reducing yours.
cheers,
John
"L'Huillier, Denis" <dlhuilli AT exchange.ml DOT com> on 08/06/2002 03:07:13 PM
Please respond to "ADSM: Dist Stor Manager" <adsm-l AT vm.marist DOT edu>
To: adsm-l AT vm.marist DOT edu
cc: (bcc: John Naylor/HAV/SSE)
Subject: BUFPoolSize - what am I missing out on?
Hello,
ENV: OS/390 TSM 4.1
I have a question about Bufpoolsize.. From what I read it should be at least
98%.
What is the impact if it's below this? I'm currently at about 94% and 214MB
Bufpoolsize.
All my backups complete within the backup window (over 1200 nodes). I'm all for
getting it to
98% but I need some justification as to how having a bufpoolsize below 98% is
impacting performance.
Also, while I'm on the topic..
What about selftunebufpoolsize? I'm running on OS/390 and don't want to take all
the available
memory by setting it to 'YES'. Does anybody know what increments
selftunebufpoolsize uses each time it
Makes an adjustment?
Is selftunebufpoolsize recommended for a 390 Env?
Is there any type of formula I can apply to the size of my database and
calculate what my Bufpoolsize should be (ballpark)?
I've already increased it from 128000 to 214000 and made a whopping jump from
93% to 94%.
Anybody want to share their bufpoolsize for their database of approx. 30GB (used
pages)?
Anybody have some experience where increasing the Bufpoolsize helped a
performance or any issue?
Thanks!
-Denis
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