Re: Best Practices

   So,
   If I have 1.2 GB allocated to a (Fixed) memory pool used just for a DPAR,
   and a SHOW STAT MEM shows that I'm only using 944MB, can I assume that I'm
   wasting about 200MB with of memory and can reduce the pool size? Prior to
   this message thread, our NSF Buffer pool was still manualy set at 300MB,
   in which case I was wasting more than 700MB?

   Mem.Allocated = 944,450,548
   Mem.Allocated.Process = 63,273,308
   Mem.Allocated.Shared = 881,177,240
   Mem.Availability = Plentiful
   Mem.PhysicalRAM = 1,258,291,200

   ====================================
   Tom Kreimer
   Information Alternatives

   -----domino400-bounces+tkreimer=infoalt.com@xxxxxxxxxxxx wrote: -----

   To: Lotus Domino on the iSeries / AS400 <domino400@xxxxxxxxxxxx>
   From: "Patrick Trapp" <ptrapp@xxxxxxxxxxxx>
   Sent by: domino400-bounces+tkreimer=infoalt.com@xxxxxxxxxxxx
   Date: 08/10/2006 09:29AM
   Subject: Re: Best Practices

   Yeah, I didn't try to quote the entire section of book -- we all know I'm
   wordy enough without plagiarizing in my posts.  Right now, my pool size is
   at the default 748 and my %reads yesterday are running 98% - 99%.  Today,
   the numbers are more reasonable, but they still indicate that a change is
   in order.

   Thanks for the confirmation.

   Patrick

              Chris Whisonant
              <Chris.Whisonant@
              comporium.com>                                             To
              Sent by:                  Lotus Domino on the iSeries / AS400
              domino400-bounces         <domino400@xxxxxxxxxxxx>
              +ptrapp=nex-tech.                                          cc
              com@xxxxxxxxxxxx
                                        Subject
                                        Re: Best Practices
              08/10/2006 07:15
              AM

              Please respond to
              Lotus Domino on
                 the iSeries /
                 AS400
              <domino400@midran
              ge.com>

   That sounds about right. What's your current pool size? If you drop it and
   the %reads goes below 95%, then you should raise it. Also, it's generally
   recommended to raise or lower the buffer pool in increments of 10%.

   Something else I found out is that if you don't define the buffer pool
   size, then the defaults are as follows:

   NSF Buffer Pool ? how size is set
   Domino R5 - Set to 300 MB by default on iSeries
   Domino 6 - Set to 748 MB by default on iSeries
   Domino 7 - Set to 748 MB by default on iSeries

   What to monitor when fine tuning
   Non-database paging faulting = < 100 faults/processor
   Database.BufferPool.PercentReadsInBuffer >= 95%
   Database.DbCache.MaxEntries = 3 X BufferPool

   Chris Whisonant
   Comporium
   Senior Mid-Range Systems Administrator
   IBM eServer Certified Systems Expert - iSeries Technical Solutions V5R2
   IBM Certified System Administrator - Lotus Notes and Domino 6/6.5
   IBM Certified Associate Developer - Lotus Notes and Domino 6/6.5
   803.326.7270

   domino400-bounces+chris.whisonant=comporium.com@xxxxxxxxxxxx wrote on
   08/09/2006 05:08:53 PM:

   >
   > Related to an earlier question I floated through this forum, I've been
   > investigating how big was big enough on the NSF_BUFFER_POOL_SIZE
   parameter.
   > On page 230 of the "Domino 6 for iSeries Best Practices" redbook, they
   lay
   > out some variables to compare and they make the (sort of paraphrased)
   > statement that  "The NSF_BUFFER_POOL_SIZE is too large if
   > Database.Database.BufferPool.PerCentReadsInBuffer is between 94% and
   99%,
   > but
   > Database.DbCache.MaxEntries is about 40% larger than
   > Database.DbCache.HighWaterMark."
   >
   > A little later, it indicates that it's just right if the
   > Database.DbCache.MaxEntries is not more than 20% larger than
   > Database.DbCache.HighWaterMark.
   >
   > So I'm taking this to mean that if Database.DbCache.MaxEntries is more
   then
   > 40% larger, I should consider adjusting the size of the pool down.  For
   > example, if Database.DbCache.MaxEntries is 1500 and
   > Database.DbCache.HighWaterMark is 900, the pool is larger than
   necessary.
   >
   > Does that sound right to you?
   >
   > Thanks,
   > Patrick