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3-tier architecture -- poor Manageability?

 
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Friends,
Do you agree that the drawback of the 3-tier architecture is Manageability?
Can you please share your knowledge of 1, 2 and 3 – tier architectures and their QoS?
Thank you!
Seid
 
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3-tier architecture is standard and has a higher level of manageability than say a 4-tier. Before I go off on a tangent I want to make sure we are on the same page.
1-tier Architecture
Tier 1 - Everything
2-tier Architecture
Tier 1 - Client
Tier 2 - Database
3-tier Architecture
Tier 1 - Client (Browser or Application)
Tier 2 - Web and Application (Full J2EE Server)
Tier 3 - Database
4-tier Architecture
Tier 1 - Client (Browser or Application)
Tier 2 - Web (Servlet/JSP Container)
Tier 3 - Application (EJB Container)
Tier 4 - Database
Do these match your definitions for the different tiers?
 
Seid Myadiyev
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Chris,
Thank you very much for this, but what are the benefits and drawbacks of each architecture in terms of their Quality of Service (QoS) requirements?
Thanks very much!
Seid
 
mister krabs
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One huge difference is scalability. Each time you add a tier you are making your application more scaleable because its easier to apply more horsepower to just the tier that needs it.
 
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I researched this. On the yahoo site or the JR somebody talked about Sun's codecamp. On Sun's site I found a codecamp document. An early chapter was helpful in understanding some of these issues.
I still only scored 66% on common architectures and concepts.
This is a hard area to find data on.
 
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