Re: Best Practices

You know, in my reading, I thought I found somewhere that the server set
the value for Database.DbCache.MaxEntries to be three times the BufferPool.
I don't think you need to monitor that one.  All of my tests thus far are
bearing out the idea that I am actually setting that value indirectly when
I set the BufferPool.

I'm assuming that these suggestions are also valid for QuickPlace and
Sametime servers.  Or are they different enough animals that I'm going to
cause problems?

Patrick



                                                                           
             Chris Whisonant                                               
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                                       Re: Best Practices                  
             08/10/2006 07:15                                              
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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

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