on 07-16-2008 12:00 AM
We are installing SAP ERP 6.0, SAP NetWeaver BI 7.0, SAP NetWeaver Portal 7.0 and NetWeaver PI 7,1 on iSeries/Systemi. We are having discussions about landscape and we have different views:
a) 2 tier
b) 3 tier with central instance on database server
c) 3 tier with central instance on application server
Anyone got any information they can give on the administration effort involved with the 3 options. Basically pro's and con's for each option.
Regards
Add another vote for 2-tier.
The database is integrated into the OS in the iSeries. Therefore having a separate Database server makes little sense.
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We at Plastipak have always run 2 tier and it extremely reliable. But I ask could I not put an application instance on a server in a Windows environment and off load a few of the processes to that application server. So this would leave the central instance and the database server as 2 tier and an ancillary server to take some of the load off. Would this not off load some of the work off the 2 tier and to a departmental server as 3 tier?
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As a generalisation people like the iSeries for its flexibility and ease of use. Consequently anything that takes away from that is not so good.
So I would be with everyone else on this - 2-tier is a easy and clean way to support SAP. There is normally enough for a IT Dept. to do supporting the different SAP landscapes you might have (Dev, QA, Sandbox, Training.....) without creating a few more systems to patch, upgrade etc. The ability to consolidate is one of the joys of the System i.
I can think of a few reasons why you might consider 3 tier - but they are all pretty specific. For example, on a large SAP installation which for a 2-tier solution would require many processors, if capital costs were tight if you could save i5/OS costs by splitting out the application servers into their own partitions. Then it is possible to use i5/OS Application Server Licenses for these partitions (5722 & 5761-SSB). This is the 'i5/OS without a database' license.
Another example would be if you were going to experience rapid growth and were on a platform that you didn't want to change but had limited expansion capabilities?
Multiple application servers can help with availability.
All these are reasons to consider 3-tier - but they compromise the simplicity and cost of ownership value propositions of the System i. I hope this helps.
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Hi Peter,
if you want to have an easy to use and good performing environment, you should strictly focus on 2-tier !!!
Otherwise, it will be possible, but far more complicated ...
Regards
Volker Gueldenpfennig, consolut international ag
http://www.consolut.de - http://www.4soi.de - http://www.easymarketplace.de
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Hi,
three is no such pros and cons for using two tier or three tier system landscape. it's all depends on requirements.
you can check SAP Note 484548 - iSeries: 3 tier system installation as reference.
regards,
kaushal
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