One point I'd like to highlight is that a zBX is *not* simply another blade
server chassis. One of the key reasons it's not the same is the zEnterprise
Unified Resource Manager (URM). For example, URM is able to coordinate
resource allocations and provisioning dynamically across multiple operating
systems, in effect extending some of z/OS's Workload Manager (WLM)
capabilities out into the blades. That's unique. More information available
here:

http://www.ibm.com/systems/z/hardware/zenterprise/unifiedresourcemanager.html

Another point... Yes, you *could* replicate some of the functions of a zBX
by building something else out of various parts. In practice, that's hard.
(George highlighted a common problem among many: networking run amok.) In
principle you could also write and maintain your own operating systems,
relational databases, transaction managers, service management tools, etc.,
but in practice you'd probably do it rather badly, and it would necessarily
require more labor than buying something complete and ready-to-go.

--------------------------------------------------------------------------------------------------------
Timothy Sipples
Resident Enterprise Architect (Based in Singapore)
E-Mail: timothy.sipp...@us.ibm.com
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