As with any performance related item, your mileage will vary. I
personally haven't been too impressed with DCT, nor have a number of my
colleagues. I realize this isn't much help to what you're looking for,
however here is why I say what I do.
As to whether these recommendations would make much of a difference, it is
really hard to say without looking at your specific statistics. Based on
my experiences, the one you will get the most bang for the buck
implementing is UPDATE_FULLTEXT_THREAD. Setting this variable to 1 can be
huge in environments where there is a lot of full text indexing happening.
I only like to see FT_FLY_INDEX_OFF=1 used as a last resort as it
prevents ALL full text searches on the server. The much better thing to
do on servers that do full text indexing is to make sure the proper
indexes are built so temporary indexes aren't being created and thrown
away all the time. There isn't much overhead (<0.5%) associated with
maintaining the indexes, it's the building temporary indexes and doing the
searches that is costly. In Domino 8.x, there is a database property to
not allow simple search for a database which is a MUCH better solution
than turning off full text capabilities for all databases on a server.
Looking at another example, DEBUG_PD_NAGLE_OFF=1, you're often better off
properly tuning the TCP/IP buffer sizes and ensuring there are minimal
network retransmissions occurring.
The net, IMHO, is that while DCT points out some potential items to tune
on your servers, I wouldn't expect huge improvements from the tuning
recommendations. You're much better off analyzing the specific statistics
for each Domino server along with the performance of the server or LPAR
hosting the Domino server(s). Considering you have multiple application
servers, along with ST, LEI, and QP, where you'll see significant
performance gains is by doing the proper i5/OS performance tuning
(separate memory pools, proper allocation of memory pools and run
priorities, ensuring disk and CPU are not bottlenecks, ...) along with
Domino memory management tuning compared to implementing these notes.ini
variables.
I hope this helps.
Kim
P.S. -- Atlanta was one of my favorite locations to teach those classes
in, glad you were able to attend the class.
--------
President
Kim Greene Consulting, Inc.
iSeries Domino consulting, education, and performance
www.kimgreene.com
www.bleedyellow.com/blogs/dominodiva
(507) 367-2888
From: "Crump, Mike" <Mike.Crump@xxxxxxxxxxxxxxxx>
To: "Lotus Domino on the iSeries / AS400" <domino400@xxxxxxxxxxxx>
Date: 12/03/2009 08:33 AM
Subject: RE: Domino Configuration Tuner
Sent by: domino400-bounces+kim=kimgreene.com@xxxxxxxxxxxx
We are currently using 7.0.3, getting ready to update to 8.5.1 in about
30 days.
Our servers run mostly Domino applications with a handful of Notes
applications. No email. I also have ST, LEI, and QP.
I missed this email so I'm sorry for the delay....FYI - I attended an
Lotus Admin on the iSeries class that you gave for IBM back in Atlanta
about a decade or so ago.......
Michael Crump
Manager, Computing Services
SGCI
1509 S. Macedonia Ave.
Muncie, IN 47302
765.741.7696
765.741.7012 f
Elitism
It's lonely at the top. But it's comforting to look down upon everyone
at the bottom.
This email and its attachments may be confidential and are intended
solely for the use of the individual to whom it is addressed. Any view
or opinions expressed are solely those of the author and do not
neccesarily represent those of Saint-Gobain. If you are not the
intended recipient of this email and its attachments, you must take no
action based upon them, nor must you copy or show them to anyone.
Please contact the sender if you believe you have received this email in
error.
-----Original Message-----
From: domino400-bounces+mike.crump=saint-gobain.com@xxxxxxxxxxxx
[mailto:domino400-bounces+mike.crump=saint-gobain.com@xxxxxxxxxxxx] On
Behalf Of Kim Greene
Sent: Wednesday, December 02, 2009 10:33 AM
To: Lotus Domino on the iSeries / AS400
Cc: Lotus Domino on the iSeries / AS400;
domino400-bounces+kim=kimgreene.com@xxxxxxxxxxxx
Subject: Re: Domino Configuration Tuner
Which version of Domino are you running Mike? Also, what functions does
this server perform (mail, applications, HTTP, ...)?
These make a difference on whether some of these are even applicable.
--------
President
Kim Greene Consulting, Inc.
iSeries Domino consulting, education, and performance www.kimgreene.com
www.bleedyellow.com/blogs/dominodiva
(507) 367-2888
From: "Crump, Mike" <Mike.Crump@xxxxxxxxxxxxxxxx>
To: "Lotus Domino on the iSeries / AS400" <domino400@xxxxxxxxxxxx>
Date: 12/02/2009 06:42 AM
Subject: Domino Configuration Tuner
Sent by: domino400-bounces+kim=kimgreene.com@xxxxxxxxxxxx
I'm working with DCT for the first time. I'm looking at the list of
recommended critical and high changes and trying to really gauge if they
would have a positive impact for Domino on the i.
Critical
DEBUG_PD_NAGLE_OFF=1
Warning
FTG_USE_SYS_MEMORY
FT_FLY_INDEX_OFF=1
NSF_BACKUP_MEMORY_CONSTRAINED
SERVER_NAME_LOOKUP_NO_UPDATE
UPDATE_FULLTEXT_THREAD
DCT does a nice job documenting the reasoning behind the recommended
change but of course there is no quantification. I can probably play
around on one of my DEV servers but I'm not sure if I can measure any
future improvements.
Anyone have any experience with DCT and some of these recommended
changes?
Michael Crump
Manager, Computing Services
SGCI
1509 S. Macedonia Ave.
Muncie, IN 47302
765.741.7696
765.741.7012 f
Elitism
It's lonely at the top. But it's comforting to look down upon everyone
at the bottom.
This email and its attachments may be confidential and are intended
solely for the use of the individual to whom it is addressed. Any view
or opinions expressed are solely those of the author and do not
neccesarily represent those of Saint-Gobain. If you are not the
intended recipient of this email and its attachments, you must take no
action based upon them, nor must you copy or show them to anyone.
Please contact the sender if you believe you have received this email in
error.
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