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56 IBM ^ xSeries 440 Planning and Installation Guide
Application integration
Application integration is the combining of multiple, similar applications, such
as Web servers, onto one consolidated server.
Application integration is also the combining of different application workload
types within a single server/system and migrating an application or data to a
new platform in order to collocate the application and data.
It reduces administration, operation, and facilities costs and increases
reliability and availability.
The main objective of application integration is to migrate applications from
one or several locations to a single location. Based on the consolidation
platform, this migration can take different forms:
– The migration may not bring any additional costs beyond that of relocating
the application on a new server.
– The migration may imply that application programs have to be recompiled
in order to run on the new platform.
– The migration may imply that application programs have to be redesigned
and rewritten in order to run on the consolidation platform. As for physical
server consolidation, application integration has several cases.
– Application integration is combining different application workload types
within a single server or system.
– Distributed systems do not run identical applications and system software
and have to be integrated into a consolidation server running a different
operating system.
From another point of view, consolidation takes one of three basic approaches:
Logical
Logical consolidation brings all server resources to the same level so that
they can be viewed logically as a single unified environment.
In logical consolidation, actual systems are still distributed, while
administrative procedures and processes are standardized company-wide.
This kind of consolidation is relatively easy and safe to implement, but it
carries the least potential for significant returns. Cost savings come from
better asset management and opportunities to deploy high-quality, consistent
administrative practices across the enterprise.
Physical
Physical consolidation does pretty much what it says: systems are relocated
to a single server site. The number of servers you have to manage remains
the same, and cost savings come from better staff utilization, higher service